CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (50,369)	$ (21,479)	$ (69,750)	$ (19,346)
Change in net unrealized gains (losses) on investments, available-for-sale, net of tax	887	8,137	(6,313)	4,109
Comprehensive income (loss)	$ (49,482)	$ (13,342)	$ (76,063)	$ (15,237)