CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE 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 Comprehensive Income [Abstract]
Net loss	$ (30,608)	$ (28,232)	$ (62,181)	$ (98,903)
Other comprehensive loss:
Change in unrealized gain (loss) on available for sale securities, net	(7)	(11)	(5)	(183)
Total other comprehensive loss	(7)	(11)	(5)	(183)
Comprehensive loss	$ (30,615)	$ (28,243)	$ (62,186)	$ (99,086)