Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income from consolidated operations	$ 153,557	$ 200,691
Other comprehensive income (loss):
Foreign currency translation gain	123
Net loss on available-for-sale debt securities, net of tax	(11,738)	(654)
Comprehensive income from consolidated operations	141,942	200,037
Net loss attributable to noncontrolling interest	422
Foreign currency translation gain attributable to noncontrolling interest	(119)
Comprehensive loss attributable to noncontrolling interest	303
Comprehensive income attributable to Fulgent	$ 142,245	$ 200,037