Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	November 2020 Equity Distribution Agreement	Cumulative Effect, Period of Adoption, Adjustment	Stockholders' Equity	Stockholders' Equity November 2020 Equity Distribution Agreement	Additional Paid-In Capital	Additional Paid-In Capital November 2020 Equity Distribution Agreement	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Fulgent Stockholders' Equity	Fulgent Stockholders' Equity November 2020 Equity Distribution Agreement	Fulgent Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling Interest
Beginning Balance at Dec. 31, 2020	$ 569,387		$ (887)	$ 3		$ 418,065		$ 438	$ 150,881	$ (887)	$ 569,387		$ (887)
Beginning Balance, Shares at Dec. 31, 2020				28,178,000
Equity-based compensation	2,962					2,962					2,962
Exercise of common stock options	44					44					44
Exercise of common stock options, Shares				45,000
Restricted stock awards, Shares				187,000
Common stock withholding for employee tax obligations	(513)					(513)					(513)
Common stock withholding for employee tax obligations, Shares				(4,000)
Issuance of common stock		$ 30,297					$ 30,297					$ 30,297
Issuance of common stock, Shares					583,000
Other comprehensive income (loss)	(654)							(654)			(654)
Cumulative tax effect of accounting change	239								239		239
Net income (loss)	200,691								200,691		200,691
Ending Balance at Mar. 31, 2021	801,566			$ 3		450,855		(216)	350,924		801,566
Ending Balance, Shares at Mar. 31, 2021				28,989,000
Beginning Balance at Dec. 31, 2020	569,387		$ (887)	$ 3		418,065		438	150,881	$ (887)	569,387		$ (887)
Beginning Balance, Shares at Dec. 31, 2020				28,178,000
Net income (loss)	280,338
Ending Balance at Jun. 30, 2021	920,725			$ 3		482,255		(265)	430,736		912,729			$ 7,996
Ending Balance, Shares at Jun. 30, 2021				29,513,000
Beginning Balance at Mar. 31, 2021	801,566			$ 3		450,855		(216)	350,924		801,566
Beginning Balance, Shares at Mar. 31, 2021				28,989,000
Equity-based compensation	3,526					3,526					3,526
Exercise of common stock options	24					24					24
Exercise of common stock options, Shares				4,000
Restricted stock awards, Shares				143,000
Common stock withholding for employee tax obligations	(39)					(39)					(39)
Common stock withholding for employee tax obligations, Shares				(1,000)
Issuance of common stock	27,889					27,889					27,889
Issuance of common stock, Shares				378,000
Noncontrolling interest assumed related to acquisitions	8,151													8,151
Other comprehensive income (loss)	(39)							(49)			(49)			10
Net income (loss)	79,647								79,812		79,812			(165)
Ending Balance at Jun. 30, 2021	920,725			$ 3		482,255		(265)	430,736		912,729			7,996
Ending Balance, Shares at Jun. 30, 2021				29,513,000
Beginning Balance at Dec. 31, 2021	$ 1,165,880			$ 3		501,908		(759)	657,597		1,158,749			7,131
Beginning Balance, Shares at Dec. 31, 2021	30,160,000			30,160,000
Equity-based compensation	$ 5,616					5,616					5,616
Exercise of common stock options	16					16					16
Exercise of common stock options, Shares				3,000
Restricted stock awards, Shares				172,000
Common stock withholding for employee tax obligations	(494)					(494)					(494)
Common stock withholding for employee tax obligations, Shares				(8,000)
Other comprehensive income (loss)	(11,615)							(11,734)			(11,734)			119
Net income (loss)	153,557								153,979		153,979			(422)
Ending Balance at Mar. 31, 2022	1,312,960			$ 3		507,046		(12,493)	811,576		1,306,132			6,828
Ending Balance, Shares at Mar. 31, 2022				30,327,000
Beginning Balance at Dec. 31, 2021	$ 1,165,880			$ 3		501,908		(759)	657,597		1,158,749			7,131
Beginning Balance, Shares at Dec. 31, 2021	30,160,000			30,160,000
Net income (loss)	$ 164,656
Ending Balance at Jun. 30, 2022	$ 1,310,733			$ 3		504,066		(22,417)	823,113		1,304,765			5,968
Ending Balance, Shares at Jun. 30, 2022	30,481,000			30,266,000
Beginning Balance at Mar. 31, 2022	$ 1,312,960			$ 3		507,046		(12,493)	811,576		1,306,132			6,828
Beginning Balance, Shares at Mar. 31, 2022				30,327,000
Equity-based compensation	8,030					8,030					8,030
Exercise of common stock options	3					3					3
Exercise of common stock options, Shares				1,000
Restricted stock awards, Shares				161,000
Common stock withholding for employee tax obligations	(436)					(436)					(436)
Common stock withholding for employee tax obligations, Shares				8,000
Repurchase of common stock	$ (10,577)					(10,577)					(10,577)
Repurchase of common stock, Shares	(215,000)			(215,000)
Other comprehensive income (loss)	$ (10,346)							(9,924)			(9,924)			(422)
Net income (loss)	11,099								11,537		11,537			(438)
Ending Balance at Jun. 30, 2022	$ 1,310,733			$ 3		$ 504,066		$ (22,417)	$ 823,113		$ 1,304,765			$ 5,968
Ending Balance, Shares at Jun. 30, 2022	30,481,000			30,266,000