CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (24,781)	$ (20,745)	$ (94,531)	$ (40,091)
Change in net unrealized gains (losses) on investments, available-for-sale, net of tax	(2,631)	1,373	(8,944)	5,482
Comprehensive income (loss)	$ (27,412)	$ (19,372)	$ (103,475)	$ (34,609)