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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2017	May 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Trading Symbol	FLGT
Entity Registrant Name	Fulgent Genetics, Inc.
Entity Central Index Key	0001674930
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		17,692,247

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 6,734	$ 7,897
Marketable securities	20,633	12,971
Trade accounts receivable, net of allowance for doubtful accounts of $151 and $151, respectively	4,601	4,364
Other current assets	1,202	906
Total current assets	33,170	26,138
Marketable securities, long term	19,643	25,597
Fixed assets, net	5,894	6,234
Deferred tax asset	44	54
Other long-term assets	69	17
Total long-term assets	25,650	31,902
Total assets	58,820	58,040
Current liabilities
Accounts payable	2,306	2,756
Accrued liabilities	745	436
Income tax payable	230	124
Total current liabilities	3,281	3,316
Other long-term liabilities		2
Deferred tax liability	243	243
Total liabilities	3,524	3,561
Commitments and contingencies (Note 8)
Stockholders’ equity
Common stock, $0.0001 par value per share, 200,000 shares authorized, 17,681 and 17,676 shares issued and outstanding at March 31, 2017 and December 31, 2016 respectively	2	2
Preferred stock, $0.0001 par value per share, 1,000 shares authorized, no shares issued or outstanding at March 31, 2017 and December 31, 2016
Additional paid-in capital	110,301	109,734
Accumulated other comprehensive loss	(85)	(103)
Accumulated deficit	(54,922)	(55,154)
Total stockholders’ equity	55,296	54,479
Total liabilities and stockholders’ equity	$ 58,820	$ 58,040

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 151	$ 151
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	17,681,000	17,676,000
Common stock, shares outstanding	17,681,000	17,676,000
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 5,306	$ 3,440
Cost of revenue	1,859	1,304
Gross profit	3,447	2,136
Operating expenses:
Research and development	851	561
Selling and marketing	891	301
General and administrative	1,486	1,889
Total operating expenses	3,228	2,751
Operating income (loss)	219	(615)
Interest and other income (expense)	119	13
Income (loss) before income taxes	338	(602)
Provision for income taxes	106	0
Income (loss) from continuing operations	232	(602)
Income (loss) from discontinued operations	0	59
Net income (loss)	$ 232	$ (543)
Income (loss) per common share:
Basic	$ 0.01	$ (0.05)
Diluted	$ 0.01	$ (0.05)
Weighted-average common shares:
Basic	17,676	12,077
Diluted	18,178	12,077

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 232	$ (543)
Other comprehensive loss, net of tax:
Net unrealized loss on marketable securities	(18)
Comprehensive income (loss)	$ 214	$ (543)

Condensed Consolidated Statements of Stockholders' Equity (unaudited) - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning Balance at Dec. 31, 2016	$ 54,479	$ 2	$ 109,734	$ (103)	$ (55,154)
Beginning Balance, Shares at Dec. 31, 2016	17,676,000	17,676,000
Equity-based compensation	$ 565		565
Exercise of common stock options	2		2
Exercise of common stock options, Shares		5,000
Other comprehensive loss, net	18			18
Net income (loss)	232				232
Ending Balance at Mar. 31, 2017	$ 55,296	$ 2	$ 110,301	$ (85)	$ (54,922)
Ending Balance, Shares at Mar. 31, 2017	17,681,000	17,681,000

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flow from operating activities:
Net income (loss)	$ 232	$ (543)
Income (loss) from discontinued operations	0	59
Income (loss) from continuing operations	232	(602)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Equity-based compensation	565	1,625
Depreciation and amortization	412	199
Amortization of premium of marketable securities	95
Excess tax benefits	(59)
Changes in operating assets and liabilities:
Accounts receivable	(237)	(676)
Other current assets	(343)	(81)
Accounts payable	(433)	379
Taxes payable	165
Accrued liabilities	310	48
Cash provided by continuing operations	707	892
Cash used in discontinued operations		(17)
Net cash provided by operating activities	707	875
Cash flow from investing activities:
Purchases of fixed assets	(90)	(177)
Purchase of marketable securities	(2,780)
Maturities of marketable securities	1,000
Net cash used in investing activities	(1,870)	(177)
Cash flow from financing activities:
Capital contributions
Net cash provided by financing activities
Net (decrease) increase in cash	(1,163)	698
Cash balance at beginning of period	7,897	498
Cash balance at end of period	6,734	1,196
Supplemental cash flow information:
Fixed assets included in accounts payable	$ 11	159
Initial public offering costs included in accounts payable and accrued expenses		$ 243

Condensed Consolidated Statements of Cash Flows (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement Of Cash Flows [Abstract]
Cash from discontinued operations, beginning	$ 0	$ 9

Overview and Basis of Presentation

3 Months Ended

Mar. 31, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Overview and Basis of Presentation

Note 1. Overview and Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”).

Nature of the Business

Fulgent Genetics, Inc., together with its subsidiaries (collectively referred to as the “Company,” unless otherwise noted or the context otherwise requires), is a rapidly growing technology company with an initial focus on offering comprehensive genetic testing to provide physicians with clinically actionable diagnostic information they can use to improve the overall quality of patient care (the “Diagnostics business”). The Company has developed a proprietary technology platform that allows it to offer a broad and flexible test menu and continually expand and improve its proprietary genetic reference library. The Company’s current test menu offers single-gene tests and pre-established, multi-gene, disease-specific panels that collectively test for many genetic conditions, including various cancers, cardiovascular diseases, neurological disorders and pediatric conditions. The Company’s existing customer base consists primarily of hospitals and medical institutions, which are frequent and high-volume users of genetic tests and which typically pay the Company directly for its tests.

Background and Reorganization

The Company was incorporated in the State of Delaware on May 13, 2016. On August 2, 2016, pursuant to the approval of the board of directors of the Company, the Company changed its name from Fulgent Diagnostics, Inc. to Fulgent Genetics, Inc. On September 30, 2016, the Company completed a reorganization pursuant to which Fulgent Therapeutics LLC, a California limited liability company (referred to, together with its former subsidiary unless otherwise noted or the context otherwise requires, as “Fulgent LLC”), became a wholly owned subsidiary of the Company (the “Reorganization”). Prior to the Reorganization, the Company had no material assets and had not conducted any activities other than those incidental to its incorporation and preparation for the initial public offering of its common stock. Following the Reorganization, the Company is a holding company with no material assets other than 100% of the equity interests in Fulgent LLC and its other subsidiaries, and Fulgent LLC is considered the Company’s predecessor for accounting purposes and its financial statements for all periods prior to completion of the Reorganization constitute the Company’s historical financial statements.

For purposes of these notes and the accompanying condensed consolidated financial statements: (i) Fulgent LLC’s operating agreement, as amended from time to time, is referred to as the “Operating Agreement;” (ii) Fulgent LLC’s equity holders are referred to as “members;” (iii) Fulgent LLC’s authorized, issued and outstanding equity interests prior to the Reorganization are referred to as “units” and consisted of Class D common units and Class D-1 and Class D-2 preferred units; (iv) certain of Fulgent LLC’s Class D common units outstanding prior to the Reorganization constituted profits interests (which are sometimes referred to simply as “profits interests”), which are a type of equity-based award containing a participation threshold (which is sometimes referred to as a “profits interest threshold”) that entitled the recipient of the award to participate in the value of Fulgent LLC only to the extent it appreciated from and after the grant date of the award; and (v) prior to the Reorganization, Fulgent LLC was managed by its Manager, Ming Hsieh, who was also Fulgent LLC’s controlling equity holder. In the Reorganization, each outstanding 7.6 units of Fulgent LLC were cancelled in exchange for one share of the Company’s common stock, such that (i) all outstanding Class D common units of Fulgent LLC (including profits interests) were cancelled in exchange for an aggregate of 4,059,900 shares of the Company’s common stock; (ii) all outstanding Class D-1 preferred units of Fulgent LLC were cancelled in exchange for an aggregate of 6,760,733 shares of the Company’s common stock; (iii) all outstanding Class D-2 preferred units were cancelled in exchange for an aggregate of 2,025,623 shares of the Company’s common stock; (iv) all outstanding options to acquire common units of Fulgent LLC were cancelled in exchange for equivalent options to acquire up to an aggregate of 591,112 shares of the Company’s common stock, and all such options became immediately exercisable to the extent vested; and (v) all outstanding restricted share units relating to common units of Fulgent LLC were cancelled in exchange for equivalent restricted stock units (“RSUs”) relating to 65,789 shares of the Company’s common stock. The Reorganization was accounted for as a common control transaction and no gain or loss was recorded.

Unaudited Interim Financial Information

The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. These interim condensed consolidated financial statements have been prepared on the same basis as the Company’s audited consolidated financial statements as of and for the fiscal year ended December 31, 2016, which are included in the Company’s annual report on Form 10-K filed with the Securities and Exchange Commission on March 16, 2017 (the “2016 Annual Report”), and, in the opinion of management, include all adjustments, which are normal and recurring in nature, necessary for a fair presentation of the Company's financial position and results of operations. Operating results for interim periods are not necessarily indicative of the results that may be expected for a full fiscal year or any other period. The accompanying condensed consolidated balance sheet as of December 31, 2016 has been derived from the Company’s audited consolidated financial statements at that date but does not include all of the disclosures required by U.S. GAAP. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the Company’s audited consolidated financial statements included in the 2016 Annual Report, including the notes thereto.

Discontinued Operations

The Company historically conducted two lines of business: the Diagnostics business, which the Company conducted directly and which is the only business it is presently pursuing, and its former pharmaceutical business (the “Pharma business”), which was conducted by its former wholly owned subsidiary, Fulgent Pharma LLC (“Fulgent Pharma”). In addition, Fulgent LLC’s equity interests were separated into two series based on these two lines of business, with the holders of Fulgent LLC’s Class D preferred units and Class D voting and non-voting common units (collectively, the “Class D units”) having economic rights based on the Diagnostics business, and the holders of Fulgent LLC’s Class P preferred units and Class P voting and non-voting common units (collectively, the “Class P units”) having economic rights based on the Pharma business. These Class D units and Class P units were intended to “track,” or reflect, the relative performance of the Diagnostics business and the Pharma business, respectively.

In April 2016, Fulgent LLC’s Operating Agreement was amended and restated to provide for the distribution of Fulgent Pharma in full redemption and cancellation of the Class P units. On April 4, 2016, Fulgent LLC completed the split-off of Fulgent Pharma and the Pharma business by redeeming all of the then-outstanding Class P units and distributing to each holder of Class P units substantially identical shares of Fulgent Pharma and causing Fulgent Pharma to assume all then-outstanding options to purchase Class P units. All Class P units were immediately cancelled upon redemption. The split-off of the Pharma business was a pro-rata distribution to all of the holders of Class P units, but did not involve the holders of Fulgent LLC’s Class D units. The Manager and controlling equity holder of Fulgent LLC prior to the Reorganization, Mr. Hsieh, is the Manager and controlling equity holder of Fulgent Pharma. As a result, the split-off of the Pharma business was accounted for as a common control transaction and the recorded amount of Fulgent Pharma’s net assets was transferred to the holders of Class P units and no gain or loss was recorded.

The split-off of the Pharma business is presented as discontinued operations in the accompanying condensed consolidated financial statements for all periods presented.

The major components of statements of operations data comprising the income (loss) from discontinued operations are as follows:

	Three months Ended March 31,
	2017		2016
	(in thousands)
Operating expenses:
Research and development	$	—	$	332
General and administrative		—		9
Total operating expenses		—		341
Operating Income (loss)		—		(341	)
Other income		—		400
Income (loss)	$	—	$	59

Weighted-average Class P common units - profits interests - outstanding, basic and diluted		—	$	0.00
Weighted-average Class P preferred units outstanding, basic and diluted		—	$	0.00
Weighted-average Class P common units - profits interests - outstanding, basic and diluted		—		39,000
Weighted-average Class P preferred units outstanding, basic and diluted		—		51,000

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2. Summary of Significant Accounting Policies See the summary of the Company’s significant accounting policies set forth in the notes to its consolidated financial statements included in the 2016 Annual Report. Except as described below, no such policies materially changed during the three months ended March 31, 2017. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting periods. These estimates, judgments and assumptions are based on historical data and experience available at the date of the accompanying condensed consolidated financial statements, as well as various other factors management believes to be reasonable under the circumstances. Actual results could differ from these estimates. On an on-going basis, management evaluates its estimates, primarily those related to: (i) revenue recognition criteria, (ii) accounts receivable and allowances for doubtful accounts, (iii) the useful lives of fixed assets, and (iv) estimates of tax liabilities. Reporting Segment and Geographic Information Reporting segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision-maker in making decisions regarding resource allocation and assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company views its operations and manages its business in one reporting segment. Concentration of Customers In certain periods, a small number of customers has accounted for a significant portion of the Company’s revenue. In the three months ended March 31, 2017, and aggregating customers that are under common control or are affiliates, four customers contributed 15%, 14%, 11%, and 10% of our total revenue, respectively. Emerging Growth Company Pursuant to the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), a company constituting an “emerging growth company” is, among other things, entitled to rely upon certain reduced reporting requirements. The Company is an emerging growth company, but has irrevocably elected not to take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. As a result, the Company will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required for public companies that are not emerging growth companies. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606)-Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606)-Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606)-Narrow-Scope Improvements and Practical Expedients, which further clarifies guidance on collectability, noncash consideration, presentation of sales tax, practical expedients and transition. In December 2016, the FASB issued ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, which makes minor corrections or minor improvements to the codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. These standards, pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date (Topic 606) issued by the FASB in August 2015, will be effective for annual periods (including interim periods) beginning after December 15, 2017. The Company has commenced its assessment of these new standards, developed a project plan to guide the implementation, and is evaluating the impact these new standards will have on its consolidated financial statements. The standard can be applied either retrospectively to each period presented or as a cumulative effect adjustment as of the date of adoption. The Company plans to implement these standards effective January 1, 2018 based on the modified retrospective method and continues to evaluate the effect this ASU will have on its consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, including a provision that requires equity investments (except for investments accounted for under the equity method of accounting) to be measured at fair value, with changes in fair value recognized in current earnings. The ASU is effective for the Company in the first quarter of 2018, with early adoption permitted. The Company is currently evaluating the effect this ASU will have on its consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The update is aimed at making leasing activities more transparent and comparable, and requires substantially all leases be recognized by lessees on their balance sheet as a right-of-use asset and corresponding lease liability, including leases currently accounted for as operating leases. This guidance will become effective for interim and annual reporting periods beginning with the year ending December 31, 2019. The standard requires the use of a modified retrospective transition approach for existing leases. Early adoption is permitted. The Company is currently evaluating the effect this ASU will have on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments. ASU 2016-13 replaces the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses. The update is intended to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The standard will be effective for annual reporting periods beginning after December 15, 2019, including interim periods within those reporting periods. Early adoption is permitted. The Company has not yet evaluated the effect this ASU will have on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230). The standard clarifies the way certain cash receipts and cash payments are classified with the objective of reducing the existing diversity in practice. The standard is effective for fiscal years and interim periods beginning after December 15, 2017. Early adoption is permitted for all periods beginning after December 15, 2016. The Company is currently evaluating the effect this ASU will have on its consolidated financial statements and related disclosures. In March 2017, the FASB issued ASU No. 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20). Under the ASU, entities must amortize to the earliest call date the premium on certain purchased callable debt securities. The ASU does not require any accounting change for debt securities held at a discount. The ASU is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted for all entities, including in an interim period. The Company has not yet evaluated the effect this ASU will have on its consolidated financial statements and related disclosures.

Marketable Securities

3 Months Ended

Mar. 31, 2017

Investments Debt And Equity Securities [Abstract]

Marketable Securities

Note 3. Marketable Securities

The Company’s marketable securities consisted of the following as of March 31, 2017 and December 31, 2016:

	March 31, 2017
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Marketable securities:
Money market accounts	$	6		$	—	$	—		$	6
Corporate debt securities		40,407			—		(132	)		40,275
Less: Cash equivalents		(6	)		—		—			(6	)
Total marketable securities	$	40,407		$	—	$	(132	)	$	40,275

	December 31, 2016
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Marketable securities:
Money market accounts	$	1,580		$	—	$	—		$	1,580
Corporate debt securities		38,728			3		(163	)		38,568
Less: Cash equivalents		(1,580	)		—		—			(1,580	)
Total marketable securities	$	38,728		$	3	$	(163	)	$	38,568

As of March 31, 2017 and December 31, 2016, the contractual maturities of the Company’s marketable securities less than one year were $20.6 million and $13.0 million, respectively, and the contractual maturities of the Company’s marketable securities greater than one year and less than five years were $19.6 million and $25.6 million, respectively. Management determined that the gross unrealized losses of $132,000 on the Company’s marketable securities as of March 31, 2017 were temporary in nature. Gross unrealized losses on the Company’s marketable securities were $163,000 as of December 31, 2016. The Company currently does not intend to sell these securities prior to maturity and does not consider these investments to be other-than-temporarily impaired as of March 31, 2017. There were no sales of marketable securities in any of the periods presented.

Fair Value Measurements

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 4. Fair Value Measurements

The authoritative guidance on fair value measurements establishes a framework with respect to measuring assets and liabilities at fair value on a recurring basis and non-recurring basis. Under the framework, fair value is defined as the exit price, or the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants, as of the measurement date. The framework also establishes a three-tier hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability and are developed based on market data obtained from sources independent of our Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would use in valuing the asset or liability and are developed based on the best information available in the circumstances. The hierarchy consists of the following three levels:

Level 1:

Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the

reporting entity can access at the measurement date.

Level 2:

Inputs are inputs other than quoted prices included within Level 1 that are observable for the

asset or liability, either directly or indirectly.

Level 3:

Inputs are unobservable inputs for the asset or liability.

The following table presents information about our financial assets measured at fair value on a recurring basis as of March 31, 2017, based on the three-tier fair value hierarchy:

	Fair Value Measurements at March 31, 2017
	Total		Level 1		Level 2		Level 3
	(in thousands)
Marketable securities:
Corporate debt securities	$	40,275	$	—	$	40,275	$	—
Money market accounts		6		6		—		—
Total marketable securities	$	40,281	$	6	$	40,275	$	—

The Company’s Level 1 assets include money market instruments and are valued based upon observable market prices. Level 2 assets consist of marketable investment securities consisting of corporate bonds. Level 2 securities are valued based upon observable inputs that include reported trades, broker/dealer quotes, bids and offers. As of March 31, 2017, the Company had no investments that were measured using unobservable (Level 3) inputs.

There were no transfers between fair value measurement levels during the three months ended March 31, 2017.

Gross unrealized gains or losses for cash equivalents and marketable securities as of March 31, 2017 were not material. As of March 31, 2017 there were no securities that were in an unrealized loss position for more than 12 months.

Fixed Assets

3 Months Ended

Mar. 31, 2017

Property Plant And Equipment [Abstract]

Fixed Assets

Note 5. Fixed Assets

Major classes of fixed assets consisted of the following:

		March 31,			December 31,
	Useful Lives	2017			2016
		(in thousands)
Computer hardware	3 Years	$	1,388		$	1,293
Computer software	3 Years		354			354
Machinery and equipment	5 Years		—			177
Medical lab equipment	5 Years		4,836			4,678
General equipment	3 Years		—			59
Furniture and fixtures	5 Years		86			86
Leasehold improvements	Shorter of lease term or estimated useful life		561			520
Assets not yet placed in service			1,130			1,114
Total			8,355			8,281
Less: Accumulated depreciation			(2,461	)		(2,047	)
Property and equipment, net		$	5,894		$	6,234

Depreciation expense on fixed assets totaled $412,000 and $199,000 for the three months ended March 31, 2017 and 2016, respectively.

Other Current Assets

3 Months Ended

Mar. 31, 2017

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Other Current Assets

Note 6. Other Current Assets

Other current assets consisted of the following:

	March 31,		December 31,
	2017		2016
	(in thousands)
Reagents	$	493	$	322
Prepaid expenses		463		375
Marketable securities interest receivable		223		209
Payroll tax refund		23		—
Total	$	1,202	$	906

Reagents are used for DNA sequencing applications in the Company’s DNA sequencing equipment.

Reporting Segment and Geographic Information

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Reporting Segment and Geographic Information

Note 7. Reporting Segment and Geographic Information

The Company views its operations and manages its business in one reporting segment. All long-lived assets were located in the United States during the three months ended March 31, 2017 and 2016. Revenue by region was as follows:

	Three Months Ended March 31,
	2017		2016
	(in thousands)
Revenue:
United States	$	2,090	$	1,905
Foreign:
Canada		1,083		868
China		1,525		—
Other Countries		608		667
Total	$	5,306	$	3,440

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
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+ Details

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8. Commitments and Contingencies Operating Leases The Company has commitments under various non-cancelable operating leases with varying terms through July 2018. The Company has options to renew these leases for two or three years after their expiration. The Company’s headquarters is located in Temple City, California, which is comprised of various corporate offices and a laboratory certified under the Clinical Laboratory Improvement Amendments of 1988 (“CLIA”), accredited by the College of American Pathologists (“CAP”) and licensed by the State of California Department of Public Health (“CA DPH”). A second office located in Atlanta, Georgia is used for certain research and development, customer service, report generation and other administrative functions. Rent expense for the three months ended March 31, 2017 and 2016 was approximately $53,000 and $66,000, respectively. Purchase Obligations As of March 31, 2017, the Company had purchase obligations of $3.2 million for reagents and equipment. Contingencies From time to time, the Company may be subject to legal proceedings and claims arising in the ordinary course of business. Management does not believe that the outcome of any of these matters will have a material effect on the Company’s consolidated financial position, results of operations or cash flows.

Stockholders' Equity	3 Months Ended
Stockholders' Equity	Mar. 31, 2017
Equity [Abstract]
Stockholders' Equity	Note 9. Stockholders’ Equity Components of Comprehensive Income (Loss) Comprehensive income (loss) consists of market value adjustments that represent unrealized holding gains (losses) on marketable securities, net of taxes. For the three months ended March 31, 2017 and 2016, the tax effects related to unrealized holding gains (losses) on marketable securities were $48,000 and zero respectively. Certificate of Incorporation In accordance with the Company’s certificate of incorporation, the Company is authorized to issue 200,000,000 shares of common stock, with a par value of $0.0001 per share, and 1,000,000 shares of preferred stock, with a par value of $0.0001 per share. Holders of the Company’s common stock are entitled to one vote for each share held on all matters submitted to a vote of its stockholders. Holders of the Company’s common stock have no cumulative voting rights. Further, as of March 31, 2017, holders of the Company’s common stock have no preemptive, conversion, redemption or subscription rights and there are no sinking fund provisions applicable to the Company’s common stock. Upon liquidation, dissolution or winding-up of the Company, holders of the Company’s common stock are entitled to share ratably in all assets remaining after payment of all liabilities and the liquidation preferences of any outstanding shares of preferred stock. Subject to preferences that may be applicable to any outstanding shares of preferred stock, holders of the Company’s common stock are entitled to receive dividends, if any, as may be declared from time to time by the Company’s board of directors. As of March 31, 2017, there were no outstanding shares of preferred stock.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Equity-Based Compensation

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Equity-Based Compensation

Note 10. Equity-Based Compensation

Equity-based compensation expense for awards granted to employees is measured based on the fair value of the award on the grant date and recognized in the Company’s consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award (generally, the vesting period of the award). Compensation expense for awards with both a service and performance condition is recognized over the period required to achieve both conditions using the accelerated attribution method. The Company estimates the fair value of stock options using the Black-Scholes option valuation model. The Company measures the fair value of RSUs and share awards based on the fair value of the underlying shares on the date of grant. For awards of Fulgent LLC profits interests that were granted before the Reorganization, the fair value was measured using the Black-Scholes option valuation model.

Prior to the Reorganization, the Company’s employees and other service providers were granted awards under the Fulgent Therapeutics LLC Amended and Restated 2015 Equity Incentive Plan (the “2015 Plan”), which provided for the issuance of equity-based awards to eligible employees, directors and consultants. These awards generally consisted of options, RSUs and profits interests. Options granted under the 2015 Plan typically vested over four years and expired 10 years from the date of grant, and were not exercisable, whether or not vested, until the earlier of a liquidity event or incorporation, each as defined in the 2015 Plan. Because the options were subject to both a service condition (as set forth in their vesting schedules) and a performance condition (the occurrence of a qualifying liquidity event or incorporation), no equity-based compensation expense was recognized for these options until the performance condition was deemed to have been satisfied upon completion of the Reorganization. RSUs granted under the 2015 Plan typically vested over four years. Awards of profits interests were typically fully vested at the date of grant.

In connection with the Reorganization, the Company approved its 2016 Omnibus Incentive Plan (the “2016 Plan”), which provides for the issuance of up to an aggregate of 2,038,480 shares of the Company’s common stock pursuant to awards granted to eligible employees, directors and consultants. The vesting period, contractual life and other material terms and conditions of awards granted under the 2016 Plan are generally not significantly different from the terms and conditions of awards granted under the 2015 Plan.

The Company has included equity-based compensation expense as part of cost of revenue and operating expenses in the accompanying condensed consolidated statements of operations as follows:

	Three Months Ended March 31,
	2017		2016
	(in thousands)
Cost of revenue	$	146	$	—
Research and development		211		—
Selling and marketing		69		—
General and administrative		139		1,625
Total	$	565	$	1,625

No equity-based compensation expense related to the Pharma business and included in discontinued operations was recorded in the three months ended March 31, 2017 or 2016.

Award Activity

The below discussions of equity-based award activity, including all share numbers and weighted-average exercise prices, have been adjusted to give retroactive effect to the Reorganization as if it occurred at the beginning of each period presented.

Option Awards

The following table summarizes activity for options to acquire shares of the Company’s common stock in the three months ended March 31, 2017:

	Number of Shares Subject to Options (in thousands)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2016		556			0.85		9.0		5,976
Authorized		—
Granted		—		$	—
Exercised		(5	)	$	0.38
Canceled		(2	)	$	0.38
Balance at March 31, 2017		549			0.85		8.8	$	5,554
Exercisable as of March 31, 2017		154		$	0.38		8.6	$	1,619

As of March 31, 2017, the remaining unrecognized compensation expense of $1.2 million related to outstanding stock options is expected to be recognized over a weighted-average period of 2.6 years.

RSU Awards

The following table summarizes activity for RSUs relating to shares of the Company’s common stock in the three months ended March 31, 2017:

	Number of Shares (in thousands)			Weighted-Average Grant-Date Fair Value
Balance at December 31, 2016		362		$	9.69
Granted		17		$	11.58
Vested and settled
Forfeited		(4	)	$	9.02
Balance at March 31, 2017		375		$	9.73

As of March 31, 2017, the remaining unrecognized compensation expense of $3.2 million related to outstanding RSUs is expected to be recognized over a weighted-average period of 3.6 years.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 11. Income Taxes Prior to the Reorganization, Fulgent LLC was organized as a limited liability company and its members elected to have Fulgent LLC treated as a partnership for income tax purposes. All taxable income or loss and tax credits generally were reflected in the personal income tax returns of the Fulgent LLC’s members. Accordingly, no provision for federal or state income taxes was provided in the accompanying condensed consolidated financial statements prior to the Reorganization. Upon completion of the Reorganization, the Company converted from a pass-through entity for tax purposes to a taxable entity. Provision for income taxes consists of U.S. federal and state income taxes. A deferred tax liability is recognized for all taxable temporary differences, and a deferred tax asset is recognized for all deductible temporary differences, operating losses and tax credit carryforwards. A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. In the three months ended March 31, 2017, certain outstanding non-qualified stock options to acquire the Company’s common stock were exercised and certain outstanding RSUs relating to the Company’s common stock vested. Upon the exercise of these stock options and the vesting of these RSUs, the Company is entitled to an income tax deduction in the amount of the income recognized by the option or RSU holder, as applicable, subject to possible limitations imposed by Section 162(m) of the Internal Revenue Code and so long as the Company withholds the appropriate taxes with respect to such income (if required) and the total compensation of the option or RSU holder, as applicable, is deemed reasonable in amount. Because the Company recorded equity-based compensation expense related to stock options or RSUs in the three months ended March 31, 2017, the Company recorded the benefit from the exercise of these stock options and the vesting of these RSUs as a reduction to the Company’s provision for income taxes for the period.

Income (Loss) Per Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Income (Loss) per Share

Note 12. Income (Loss) per Share

Income (loss) per share for the three months ended March 31, 2017 and 2016 was computed as if the Reorganization had occurred at the beginning of each period presented, with the exception of Class P units, as they are not subject to the Reorganization. The following is a reconciliation of the basic and diluted income (loss) per share computations:

	Three Months Ended March 31,
	2017						2016
	Continuing Operations		Discontinued Operations		Total		Continuing Operations			Discontinued Operations		Total
	(in thousands, except per share data)
Income (loss)	$	232		—	$	232	$	(602	)	$	59	$	(543	)
Income (loss) allocable to common stockholders	$	232		—	$	232	$	(602	)	$	59	$	(543	)
Income (loss) allocated to common stockholders	$	232					$	(602	)
Income (loss) allocated to Class P common units		—	$	—				—		$	26
Income (loss) allocated to Class P preferred units		—	$	—				—			33
Weighted-average common shares—outstanding, basic		17,676		—				12,077			—
Weighted-average common shares—outstanding, diluted		18,178						12,077
Weighted-average Class P common units - profits interests - outstanding, basic and diluted		—		—				—			39,000
Weighted-average Class P preferred units outstanding, basic and diluted		—		—				—			51,000
Income (loss) per common share from continuing operations, basic	$	0.01		—			$	(0.05	)		—
Income (loss) per common share from continuing operations, diluted	$	0.01					$	(0.05	)
Income per Class P common unit - profits interests, basic and diluted		—		—				—		$	0.00
Income per Class P preferred unit, basic and diluted		—		—				—		$	0.00

On April 4, 2016, Fulgent LLC completed the split-off of the Pharma business. The financial condition and results of the Pharma business are included in the accompanying condensed consolidated financial statements as discontinued operations for all periods presented, and the weighted-average Class P units related to the Pharma business were computed through the separation date of April 4, 2016.

The Class P common and preferred units had the right to participate in earnings and distributions of Fulgent LLC but were not obligated to fund losses. As a result, in periods of net loss, Fulgent LLC allocated losses to the holders of profits interests, as they were determined to be the most subordinate unit.

The following securities have been excluded from the calculation of diluted income (loss) per share for all periods presented because their effect would have been anti-dilutive:

	Three Months Ended March 31,
	2017				2016
	Continuing Operations		Discontinued Operations		Continuing Operations		Discontinued Operations
	(in thousands)
Options		22		—		347		—
Class P unit options		—		—		—		1,810

The anti-dilutive shares disclosed above were calculated using the treasury stock method. During the three months ended March 31, 2016, the Company had outstanding stock options that were excluded from the weighted-average share calculation for continuing operations due to the Company’s net loss position. During the three months ended March 31, 2016, the Company had Class P unit options that were excluded from the weighted-average share calculation for discontinued operations because the units were contingently exercisable.

Related Party	3 Months Ended
Related Party	Mar. 31, 2017
Related Party Transactions [Abstract]
Related Party	Note 13. Related Party Dr. Yun Yen, who is a member of the Company’s Board of Directors and a stockholder, serves as the President and Chairman of the Board for the Sino-American Cancer Foundation (the “Foundation”) and served as the President for the University Taipei Medical University (the “University”), from August 1, 2011 through July 31, 2016 and currently serves as an honorary Chairman of the Board for the University. The Company, from time to time, performs research testing services for the Foundation. The Company did not recognize any revenue during the three months ended March 31, 2017 or 2016 as consideration for such services. The Company, from time to time, performs genetic sequencing services for the University. The Company recognized $12,000 and $0 as consideration for such services in the three months ended March 31, 2017 and 2016, respectively. As of March 31, 2017 and 2016, $0 and $0 was due from the Foundation and $32,000 and $0 was due from the University, respectively.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Note 14. Subsequent Events On April 25, 2017, the Company, through an affiliated company formed for the purpose of the relationship, entered into a cooperation agreement (the “JV Agreement”) with Xilong Scientific Co., Ltd. (“Xilong Scientific”) and Fuzhou Jinqiang Investment Partnership (LP) (“FJIP”) to form a joint venture under the laws of the People’s Republic of China (“PRC”) called Fujian Fujun Gene Biotech Co., Ltd. (“FF Gene Biotech”). FF Gene Biotech expects to offer comprehensive genetic testing services to customers in the PRC. Pursuant to the terms of the JV Agreement, the Company will contribute to FF Gene Biotech genetic sequencing and other equipment with a total cost of no more than 60,000,000 RMB (or approximately $8.7 million U.S. dollars) over a three-year period for a 30% ownership interest in FF Gene Biotech, Xilong Scientific will contribute to FF Gene Biotech 102,000,000 RMB over a three-year period for a 51% ownership interest in the FF Gene Biotech, and FJIP will contribute to FF Gene Biotech 19,000,000 RMB over a five-year period for a 19% ownership interest in FF Gene Biotech. Xilong Scientific is an affiliate of Xi Long USA, Inc., a large stockholder of the Company, and FJIP is owned by key management of FF Gene Biotech, including Dr. Han Lin Gao, the Chief Scientific Officer and a large stockholder of the Company, and the owner of approximately 25% of FJIP. The Board of Directors of FF Gene Biotech will be composed of three directors, one of which will be appointed by the Company and two of which will be appointed by Xilong Scientific, and will act by majority vote on all matters except for certain exceptional matters that require unanimous consent. Additionally, on April 25, 2017, the Company entered into a license agreement (the “License Agreement”) with FF Gene Biotech, pursuant to which the Company has granted to FF Gene Biotech a license to use certain of the Company’s clinical molecular diagnostic gene detection technology and related software and its proprietary reference library of genetic information, along with any improvements on this technology that the Company may develop during the term of the License Agreement. Under the License Agreement, FF Gene Biotech will pay to the Company, on a quarterly basis, certain royalties based on the revenues of FF Gene Biotech, and the Company has agreed to provide certain technical services to FF Gene Biotech in connection with the license granted under the License Agreement. The License Agreement expires on December 31, 2018 and may be extended by mutual agreement of the parties.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2017
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting periods. These estimates, judgments and assumptions are based on historical data and experience available at the date of the accompanying condensed consolidated financial statements, as well as various other factors management believes to be reasonable under the circumstances. Actual results could differ from these estimates. On an on-going basis, management evaluates its estimates, primarily those related to: (i) revenue recognition criteria, (ii) accounts receivable and allowances for doubtful accounts, (iii) the useful lives of fixed assets, and (iv) estimates of tax liabilities.
Reporting Segment and Geographic Information	Reporting Segment and Geographic Information Reporting segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision-maker in making decisions regarding resource allocation and assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company views its operations and manages its business in one reporting segment.
Concentration of Customers	Concentration of Customers In certain periods, a small number of customers has accounted for a significant portion of the Company’s revenue. In the three months ended March 31, 2017, and aggregating customers that are under common control or are affiliates, four customers contributed 15%, 14%, 11%, and 10% of our total revenue, respectively.
Emerging Growth Company	Emerging Growth Company Pursuant to the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), a company constituting an “emerging growth company” is, among other things, entitled to rely upon certain reduced reporting requirements. The Company is an emerging growth company, but has irrevocably elected not to take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. As a result, the Company will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required for public companies that are not emerging growth companies.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606)-Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606)-Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606)-Narrow-Scope Improvements and Practical Expedients, which further clarifies guidance on collectability, noncash consideration, presentation of sales tax, practical expedients and transition. In December 2016, the FASB issued ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers, which makes minor corrections or minor improvements to the codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. These standards, pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date (Topic 606) issued by the FASB in August 2015, will be effective for annual periods (including interim periods) beginning after December 15, 2017. The Company has commenced its assessment of these new standards, developed a project plan to guide the implementation, and is evaluating the impact these new standards will have on its consolidated financial statements. The standard can be applied either retrospectively to each period presented or as a cumulative effect adjustment as of the date of adoption. The Company plans to implement these standards effective January 1, 2018 based on the modified retrospective method and continues to evaluate the effect this ASU will have on its consolidated financial statements and related disclosures. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, including a provision that requires equity investments (except for investments accounted for under the equity method of accounting) to be measured at fair value, with changes in fair value recognized in current earnings. The ASU is effective for the Company in the first quarter of 2018, with early adoption permitted. The Company is currently evaluating the effect this ASU will have on its consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The update is aimed at making leasing activities more transparent and comparable, and requires substantially all leases be recognized by lessees on their balance sheet as a right-of-use asset and corresponding lease liability, including leases currently accounted for as operating leases. This guidance will become effective for interim and annual reporting periods beginning with the year ending December 31, 2019. The standard requires the use of a modified retrospective transition approach for existing leases. Early adoption is permitted. The Company is currently evaluating the effect this ASU will have on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments. ASU 2016-13 replaces the incurred loss impairment methodology in current U.S. GAAP with a methodology that reflects expected credit losses. The update is intended to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The standard will be effective for annual reporting periods beginning after December 15, 2019, including interim periods within those reporting periods. Early adoption is permitted. The Company has not yet evaluated the effect this ASU will have on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230). The standard clarifies the way certain cash receipts and cash payments are classified with the objective of reducing the existing diversity in practice. The standard is effective for fiscal years and interim periods beginning after December 15, 2017. Early adoption is permitted for all periods beginning after December 15, 2016. The Company is currently evaluating the effect this ASU will have on its consolidated financial statements and related disclosures. In March 2017, the FASB issued ASU No. 2017-08, Receivables—Nonrefundable Fees and Other Costs (Subtopic 310-20). Under the ASU, entities must amortize to the earliest call date the premium on certain purchased callable debt securities. The ASU does not require any accounting change for debt securities held at a discount. The ASU is effective for public business entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted for all entities, including in an interim period. The Company has not yet evaluated the effect this ASU will have on its consolidated financial statements and related disclosures.

Overview and Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Major Components of Statements of Operations Data Comprising Income (Loss) from Discontinued Operations

The major components of statements of operations data comprising the income (loss) from discontinued operations are as follows:

	Three months Ended March 31,
	2017		2016
	(in thousands)
Operating expenses:
Research and development	$	—	$	332
General and administrative		—		9
Total operating expenses		—		341
Operating Income (loss)		—		(341	)
Other income		—		400
Income (loss)	$	—	$	59

Weighted-average Class P common units - profits interests - outstanding, basic and diluted		—	$	0.00
Weighted-average Class P preferred units outstanding, basic and diluted		—	$	0.00
Weighted-average Class P common units - profits interests - outstanding, basic and diluted		—		39,000
Weighted-average Class P preferred units outstanding, basic and diluted		—		51,000

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64862545&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2017

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities

The Company’s marketable securities consisted of the following as of March 31, 2017 and December 31, 2016:

	March 31, 2017
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Marketable securities:
Money market accounts	$	6		$	—	$	—		$	6
Corporate debt securities		40,407			—		(132	)		40,275
Less: Cash equivalents		(6	)		—		—			(6	)
Total marketable securities	$	40,407		$	—	$	(132	)	$	40,275

	December 31, 2016
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Marketable securities:
Money market accounts	$	1,580		$	—	$	—		$	1,580
Corporate debt securities		38,728			3		(163	)		38,568
Less: Cash equivalents		(1,580	)		—		—			(1,580	)
Total marketable securities	$	38,728		$	3	$	(163	)	$	38,568

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Information about Financial Assets Measured at Fair Value on Recurring Basis Based on Three-Tier Fair Value Hierarchy

The following table presents information about our financial assets measured at fair value on a recurring basis as of March 31, 2017, based on the three-tier fair value hierarchy:

	Fair Value Measurements at March 31, 2017
	Total		Level 1		Level 2		Level 3
	(in thousands)
Marketable securities:
Corporate debt securities	$	40,275	$	—	$	40,275	$	—
Money market accounts		6		6		—		—
Total marketable securities	$	40,281	$	6	$	40,275	$	—

Fixed Assets (Tables)

3 Months Ended

Mar. 31, 2017

Property Plant And Equipment [Abstract]

Major Classes of Fixed Assets

Major classes of fixed assets consisted of the following:

		March 31,			December 31,
	Useful Lives	2017			2016
		(in thousands)
Computer hardware	3 Years	$	1,388		$	1,293
Computer software	3 Years		354			354
Machinery and equipment	5 Years		—			177
Medical lab equipment	5 Years		4,836			4,678
General equipment	3 Years		—			59
Furniture and fixtures	5 Years		86			86
Leasehold improvements	Shorter of lease term or estimated useful life		561			520
Assets not yet placed in service			1,130			1,114
Total			8,355			8,281
Less: Accumulated depreciation			(2,461	)		(2,047	)
Property and equipment, net		$	5,894		$	6,234

Other Current Assets (Tables)

3 Months Ended

Mar. 31, 2017

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Schedule of Other Current Assets

Other current assets consisted of the following:

	March 31,		December 31,
	2017		2016
	(in thousands)
Reagents	$	493	$	322
Prepaid expenses		463		375
Marketable securities interest receivable		223		209
Payroll tax refund		23		—
Total	$	1,202	$	906

Reporting Segment and Geographic Information (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting [Abstract]

Summary of Revenue by Geographic Region

Revenue by region was as follows:

	Three Months Ended March 31,
	2017		2016
	(in thousands)
Revenue:
United States	$	2,090	$	1,905
Foreign:
Canada		1,083		868
China		1,525		—
Other Countries		608		667
Total	$	5,306	$	3,440

Equity-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Equity-Based Compensation

The Company has included equity-based compensation expense as part of cost of revenue and operating expenses in the accompanying condensed consolidated statements of operations as follows:

	Three Months Ended March 31,
	2017		2016
	(in thousands)
Cost of revenue	$	146	$	—
Research and development		211		—
Selling and marketing		69		—
General and administrative		139		1,625
Total	$	565	$	1,625

Summary of Activity for Options to Acquire Common Shares

The following table summarizes activity for options to acquire shares of the Company’s common stock in the three months ended March 31, 2017:

	Number of Shares Subject to Options (in thousands)			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2016		556			0.85		9.0		5,976
Authorized		—
Granted		—		$	—
Exercised		(5	)	$	0.38
Canceled		(2	)	$	0.38
Balance at March 31, 2017		549			0.85		8.8	$	5,554
Exercisable as of March 31, 2017		154		$	0.38		8.6	$	1,619

Summary of Activity for RSUs Relating to Shares of Company's Common Stock

The following table summarizes activity for RSUs relating to shares of the Company’s common stock in the three months ended March 31, 2017:

	Number of Shares (in thousands)			Weighted-Average Grant-Date Fair Value
Balance at December 31, 2016		362		$	9.69
Granted		17		$	11.58
Vested and settled
Forfeited		(4	)	$	9.02
Balance at March 31, 2017		375		$	9.73

Income (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of the Basic and Diluted Income (Loss) Per Share Computations

	Three Months Ended March 31,
	2017						2016
	Continuing Operations		Discontinued Operations		Total		Continuing Operations			Discontinued Operations		Total
	(in thousands, except per share data)
Income (loss)	$	232		—	$	232	$	(602	)	$	59	$	(543	)
Income (loss) allocable to common stockholders	$	232		—	$	232	$	(602	)	$	59	$	(543	)
Income (loss) allocated to common stockholders	$	232					$	(602	)
Income (loss) allocated to Class P common units		—	$	—				—		$	26
Income (loss) allocated to Class P preferred units		—	$	—				—			33
Weighted-average common shares—outstanding, basic		17,676		—				12,077			—
Weighted-average common shares—outstanding, diluted		18,178						12,077
Weighted-average Class P common units - profits interests - outstanding, basic and diluted		—		—				—			39,000
Weighted-average Class P preferred units outstanding, basic and diluted		—		—				—			51,000
Income (loss) per common share from continuing operations, basic	$	0.01		—			$	(0.05	)		—
Income (loss) per common share from continuing operations, diluted	$	0.01					$	(0.05	)
Income per Class P common unit - profits interests, basic and diluted		—		—				—		$	0.00
Income per Class P preferred unit, basic and diluted		—		—				—		$	0.00

Anti-dilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share

The following securities have been excluded from the calculation of diluted income (loss) per share for all periods presented because their effect would have been anti-dilutive:

	Three Months Ended March 31,
	2017				2016
	Continuing Operations		Discontinued Operations		Continuing Operations		Discontinued Operations
	(in thousands)
Options		22		—		347		—
Class P unit options		—		—		—		1,810

Overview and Basis of Presentation - Additional Information (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) shares
Description Of Business And Basis Of Presentation [Line Items]
Place of incorporation	Delaware
Date of incorporation	May 13, 2016
Date of corporate name change	Aug. 02, 2016
Fulgent Therapeutics LLC
Description Of Business And Basis Of Presentation [Line Items]
Ownership percentage in subsidiary	100.00%
Units cancelled in exchange for one share of common stock	7.6
Share of common stock exchanged for seven point six units	1
Gain (loss) on reorganization \| $	$ 0
Fulgent Therapeutics LLC \| Maximum
Description Of Business And Basis Of Presentation [Line Items]
Options to acquire units cancelled in exchange for company’s common stock	591,112
Fulgent Therapeutics LLC \| Restricted Stock Units (RSUs)
Description Of Business And Basis Of Presentation [Line Items]
Units cancelled in exchange for restricted stock units relating to company’s common stock	65,789
Fulgent Therapeutics LLC \| Class D-1 Preferred Units
Description Of Business And Basis Of Presentation [Line Items]
Number of common stock shares exchanged for cancelled units	6,760,733
Fulgent Therapeutics LLC \| Class D-2 Preferred Units
Description Of Business And Basis Of Presentation [Line Items]
Number of common stock shares exchanged for cancelled units	2,025,623
Fulgent Therapeutics LLC \| Class D Common Units
Description Of Business And Basis Of Presentation [Line Items]
Number of common stock shares exchanged for cancelled units	4,059,900

Overview and Basis of Presentation - Major Components of Statements of Operations Data Comprising Income (Loss) from Discontinued Operations (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) $ / shares shares
Operating expenses:
Research and development	$ 332
General and administrative	9
Total operating expenses	341
Operating Income (loss)	(341)
Other income	400
Income (loss)	$ 59
Class P Common Units \| Discontinued Operations
Operating expenses:
Weighted-average Class P common units - profits interests - outstanding, basic and diluted \| $ / shares	$ 0.00
Weighted-average Class P common units - profits interests - outstanding, basic and diluted \| shares	39,000
Class P Preferred Units \| Discontinued Operations
Operating expenses:
Weighted-average Class P preferred units outstanding, basic and diluted \| $ / shares	$ 0.00
Weighted-average Class P preferred units outstanding, basic and diluted \| shares	51,000

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 Segment Customer
Summary Of Significant Accounting Policies [Line Items]
Number of reporting segments \| Segment	1
Revenue \| Customer Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Number of customers \| Customer	4
Revenue \| Customer Concentration Risk \| Customer One
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	15.00%
Revenue \| Customer Concentration Risk \| Customer Two
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	14.00%
Revenue \| Customer Concentration Risk \| Customer Three
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	11.00%
Revenue \| Customer Concentration Risk \| Customer Four
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	10.00%

Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available For Sale Securities [Line Items]
Marketable securities, Amortized Cost Basis	$ 40,407	$ 38,728
Marketable securities, Unrealized Gains		3
Marketable securities, Unrealized Loses	(132)	(163)
Marketable securities, Aggregate Fair Value	40,275	38,568
Less: Cash equivalents	(6)	(1,580)
Money Market Accounts
Schedule of Available For Sale Securities [Line Items]
Marketable securities, Amortized Cost Basis	6	1,580
Marketable securities, Aggregate Fair Value	6	1,580
Corporate Debt Securities
Schedule of Available For Sale Securities [Line Items]
Marketable securities, Amortized Cost Basis	40,407	38,728
Marketable securities, Unrealized Gains		3
Marketable securities, Unrealized Loses	(132)	(163)
Marketable securities, Aggregate Fair Value	$ 40,275	$ 38,568

Marketable Securities - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]
Marketable securities less than one year	$ 20,633,000	$ 12,971,000
Marketable securities greater than one year and less than five years	19,643,000	25,597,000
Gross unrealized loss	132,000	$ 163,000
Sales of marketable securities	$ 0

- Definition

Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References + Details

Fair Value Measurements - Information about Financial Assets Measured at Fair Value on Recurring Basis Based on Three-Tier Fair Value Hierarchy (Details) - Fair Value Measurements Recurring $ in Thousands	Mar. 31, 2017 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total marketable securities	$ 40,281
Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total marketable securities	40,275
Money Market Accounts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total marketable securities	6
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total marketable securities	6
Level 1 \| Money Market Accounts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total marketable securities	6
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total marketable securities	40,275
Level 2 \| Corporate Debt Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total marketable securities	$ 40,275

Fair Value Measurements - Additional Information (Details)	Mar. 31, 2017 USD ($)
Fair Value Disclosures [Abstract]
Fair value asset, investments measured using unobservable inputs	$ 0
Fair value assets, transfers between levels, amount	0
Securities in an unrealized loss position for more than 12 months	$ 0

Fixed Assets - Major Classes of Fixed Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 8,355	$ 8,281
Less: Accumulated depreciation	(2,461)	(2,047)
Fixed assets, net	5,894	6,234
Computer Hardware
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 1,388	1,293
Useful life in years	3 years
Computer Software
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 354	354
Useful life in years	3 years
Machinery and Equipment
Property Plant And Equipment [Line Items]
Fixed assets, gross		177
Useful life in years	5 years
Medical Lab Equipment
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 4,836	4,678
Useful life in years	5 years
General Equipment
Property Plant And Equipment [Line Items]
Fixed assets, gross		59
Useful life in years	3 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 86	86
Useful life in years	5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 561	520
Useful life in years	Shorter of lease term or estimated useful life
Assets Not Yet Placed in Service
Property Plant And Equipment [Line Items]
Fixed assets, gross	$ 1,130	$ 1,114

Fixed Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property Plant And Equipment [Abstract]
Depreciation expense on fixed assets	$ 412	$ 199

Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Reagents	$ 493	$ 322
Prepaid expenses	463	375
Marketable securities interest receivable	223	209
Payroll tax refund	23
Total	$ 1,202	$ 906

Reporting Segment and Geographical Information - Additional Information (Details)	3 Months Ended
	Mar. 31, 2017 Segment
Segment Reporting [Abstract]
Number of reporting segments	1

Reporting Segment and Geographical Information - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 5,306	$ 3,440
United States
Segment Reporting Information [Line Items]
Revenue	2,090	1,905
Canada
Segment Reporting Information [Line Items]
Revenue	1,083	868
China
Segment Reporting Information [Line Items]
Revenue	1,525
Other Countries
Segment Reporting Information [Line Items]
Revenue	$ 608	$ 667

Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Commitments And Contingencies [Line Items]
Operating leases, rent expense	$ 53,000	$ 66,000
Reagents and Equipment
Commitments And Contingencies [Line Items]
Purchase obligations	$ 3,200,000
Minimum \| Non Cancelable Operating Lease
Commitments And Contingencies [Line Items]
Operating leases, renewal term	2 years
Maximum \| Non Cancelable Operating Lease
Commitments And Contingencies [Line Items]
Operating leases, renewal term	3 years

Stockholders' Equity - Additional Information (Details)	3 Months Ended
Stockholders' Equity - Additional Information (Details)	Mar. 31, 2017 USD ($) Vote $ / shares shares	Mar. 31, 2016 USD ($)	Dec. 31, 2016 $ / shares shares
Class Of Stock [Line Items]
Unrealized holding gains (losses) on marketable securities \| $	$ 48,000	$ 0
Common stock, shares authorized	200,000,000		200,000,000
Common stock, par value \| $ / shares	$ 0.0001		$ 0.0001
Preferred stock, shares authorized	1,000,000		1,000,000
Preferred stock, par value \| $ / shares	$ 0.0001		$ 0.0001
Preferred stock, shares outstanding	0		0
Certificate of Incorporation
Class Of Stock [Line Items]
Common stock, shares authorized	200,000,000
Common stock, par value \| $ / shares	$ 0.0001
Preferred stock, shares authorized	1,000,000
Preferred stock, par value \| $ / shares	$ 0.0001
Preferred stock, shares outstanding	0
Certificate of Incorporation \| Common Stock
Class Of Stock [Line Items]
Number of vote per share held \| Vote	1

Equity-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense	$ 565,000	$ 1,625,000
Fulgent Therapeutics LLC \| Discontinued Operations
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense	$ 0	$ 0
2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	4 years
Equity-based compensation options contractual term	10 years
Equity-based compensation expense	$ 0
2016 Omnibus Incentive Plan \| Employees Directors and Consultants \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance under the plan	2,038,480
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected to be recognized, weighted-average period	3 years 7 months 6 days
Unrecognized compensation expense	$ 3,200,000
Restricted Stock Units (RSUs) \| 2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	4 years
Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense	$ 1,200,000
Expected to be recognized, weighted-average period	2 years 7 months 6 days

Equity-Based Compensation - Summary of Equity-Based Compensation Expenses as Part of Cost of Revenue and Operating Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 565	$ 1,625
Cost of Revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	146
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	211
Selling and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	69
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 139	$ 1,625

Equity-Based Compensation - Summary of Activity for Options to Acquire Common Shares (Details) - Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares Subject to Options, Beginning Balance	556
Number of Shares Subject to Options, Exercised	(5)
Number of Shares Subject to Options, Canceled	(2)
Number of Shares Subject to Options, Ending Balance	549	556
Number of Shares Subject to Options, Exercisable	154
Weighted-Average Exercise Price Per Shares, Beginning Balance	$ 0.85	$ 0.85
Weighted-Average Exercise Price Per Shares, Exercised	0.38
Weighted-Average Exercise Price Per Shares, Canceled	0.38
Weighted-Average Exercise Price Per Shares, Exercisable	$ 0.38
Weighted-Average Remaining Contractual Life (in years)	8 years 9 months 18 days	9 years
Weighted-Average Remaining Contractual Life (in years), Exercisable	8 years 7 months 6 days
Aggregate Intrinsic Value, Balance	$ 5,554	$ 5,976
Aggregate Intrinsic Value, Exercisable	$ 1,619

Equity-Based Compensation - Summary of Activity for RSUs Relating to Shares of Company's Common Stock (Details) - Restricted Stock Units (RSUs) - 2016 Omnibus Incentive Plan shares in Thousands	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Number of Shares, Beginning Balance \| shares	362
Number of Shares, Granted \| shares	17
Number of Shares, Forfeited/Canceled \| shares	(4)
Number of Shares, Ending Balance \| shares	375
Weighted-Average Grant-Date Fair Value, Balance \| $ / shares	$ 9.69
Weighted-Average Grant-Date Fair Value, Granted \| $ / shares	11.58
Weighted-Average Grant-Date Fair Value, Forfeited \| $ / shares	9.02
Weighted-Average Grant-Date Fair Value, Balance \| $ / shares	$ 9.73

Income Taxes - Additional Information (Details)	3 Months Ended
Income Taxes - Additional Information (Details)	Mar. 31, 2017 USD ($)
Income Tax Disclosure [Abstract]
Federal or state tax expense (benefit) prior to reorganization	$ 0

Income (Loss) Per Share - Reconciliation of Basic and Diluted Income (Loss) Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share Basic And Diluted [Line Items]
Income (loss), continuing operations	$ 232	$ (602)
Income (loss) from discontinued operations	0	59
Income (loss)	232	(543)
Income (loss) allocable to common stockholders	$ 232	$ (543)
Weighted-average common shares—outstanding, basic	17,676	12,077
Weighted-average common shares—outstanding, diluted	18,178	12,077
Income (loss) per common share from continuing operations, basic	$ 0.01	$ (0.05)
Income (loss) per common share from continuing operations, diluted	$ 0.01	$ (0.05)
Continuing Operations
Earnings Per Share Basic And Diluted [Line Items]
Income (loss) allocable to common stockholders	$ 232	$ (602)
Income (loss) allocated to common stockholders	$ 232	$ (602)
Weighted-average common shares—outstanding, basic	17,676	12,077
Weighted-average common shares—outstanding, diluted	18,178	12,077
Income (loss) per common share from continuing operations, basic	$ 0.01	$ (0.05)
Income (loss) per common share from continuing operations, diluted	$ 0.01	$ (0.05)
Discontinued Operations
Earnings Per Share Basic And Diluted [Line Items]
Income (loss) allocable to common stockholders		$ 59
Class P Preferred Units \| Discontinued Operations
Earnings Per Share Basic And Diluted [Line Items]
Income (loss) allocated to preferred units		$ 33
Weighted-average Class P preferred units outstanding, basic and diluted		51,000
Income per Class P preferred unit, basic and diluted		$ 0.00
Class P Common Units \| Discontinued Operations
Earnings Per Share Basic And Diluted [Line Items]
Income (loss) allocated to common units		$ 26
Weighted-average Class P common units - profits interests - outstanding, basic and diluted		39,000
Income per Class P common unit - profits interests, basic and diluted		$ 0.00

Income (Loss) Per Share - Anti-dilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Options \| Continuing Operations
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from continuing operations of diluted income (loss) per share	22	347
Class P Unit Options \| Discontinued Operations
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from continuing operations of diluted income (loss) per share		1,810

Related Party - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Research Testing Services
Related Party Transaction [Line Items]
Revenue from related parties	$ 0	$ 0
University
Related Party Transaction [Line Items]
Revenue from related parties	12,000	0
Due from related parties	32,000	0
Foundation
Related Party Transaction [Line Items]
Due from related parties	$ 0	$ 0

Subsequent Events - Additional Information (Details) - Apr. 25, 2017 - Subsequent Event - FF Gene Biotech $ in Millions	USD ($) Director	CNY (¥) Director
Subsequent Event [Line Items]
Number of director	3	3
Affiliated Company
Subsequent Event [Line Items]
Contribution period in joint venture	three-year	three-year
Ownership interest to be made in joint venture	30.00%	30.00%
Number of director	1	1
Affiliated Company \| Maximum
Subsequent Event [Line Items]
Contribution to be made in joint venture	$ 8.7	¥ 60,000,000
Xilong Scientific
Subsequent Event [Line Items]
Contribution to be made in joint venture \| ¥		¥ 102,000,000
Contribution period in joint venture	three-year	three-year
Ownership interest to be made in joint venture	51.00%	51.00%
Number of director	2	2
FJIP
Subsequent Event [Line Items]
Contribution to be made in joint venture \| ¥		¥ 19,000,000
Contribution period in joint venture	five-year	five-year
Ownership interest to be made in joint venture	19.00%	19.00%
FJIP \| Dr. Han Lin Gao
Subsequent Event [Line Items]
Ownership percentage	25.00%	25.00%