Condensed Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) shares in Thousands, $ 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	Noncontrolling Interest
Beginning Balance at Dec. 31, 2020	$ 569,387		$ (887)	$ 3		$ 418,065		$ 438	$ 150,881	$ (887)
Beginning Balance, Shares at Dec. 31, 2020				28,178
Equity-based compensation	2,962					2,962
Exercise of common stock options	44					44
Exercise of common stock options, Shares				45
Restricted stock awards, Shares				187
Common stock withholding for employee tax obligations	(513)					(513)
Common stock withholding for employee tax obligations, Shares				(4)
Issuance of common stock		$ 30,297					$ 30,297
Issuance of common stock, Shares					583
Other comprehensive income (loss)	(654)							(654)
Cumulative tax effect of accounting change	239								239
Net income (loss)	200,691								200,691
Ending Balance at Mar. 31, 2021	801,566			$ 3		450,855		(216)	350,924
Ending Balance, Shares at Mar. 31, 2021				28,989
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			30,160
Equity-based compensation	$ 5,616					5,616					5,616
Exercise of common stock options	16					16					16
Exercise of common stock options, Shares				3
Restricted stock awards, Shares				172
Common stock withholding for employee tax obligations	(494)					(494)					(494)
Common stock withholding for employee tax obligations, Shares				(8)
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			30,327