Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 13,884	$ 9,016	$ 31,362	$ (24,238)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation	230	(282)	366	19
Change in fair value of available for sale securities	(5)	(164)	(113)	147
Total other comprehensive income (loss)	225	(446)	253	166
Comprehensive income (loss)	14,109	8,570	31,615	(24,072)
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(1,753)		(5,938)
Comprehensive income (loss) attributable to common stockholders	$ 12,356	$ 8,570	$ 25,677	$ (24,072)