Consolidated Statements of Comprehensive Loss (Unaudited) - 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 loss	$ (34,164)	$ (21,466)	$ (64,009)	$ (44,390)
Other comprehensive income (loss):
Change in fair value of investments	(3)	128	(12)	(107)
Adjustments for net losses (gains) realized and included in net loss	0	35	0	(21)
Total change in unrealized (losses) gains on investments	(3)	163	(12)	(128)
Change in fair value of cash flow hedges	(72)	0	(201)	0
Adjustments for net gains realized and included in net loss	(174)	0	(378)	0
Total change in unrealized losses on cash flow hedges	(246)	0	(579)	0
Total other comprehensive (loss) income	(249)	163	(591)	(128)
Comprehensive loss	$ (34,413)	$ (21,303)	$ (64,600)	$ (44,518)