CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (447)	$ (9,336)	$ (60,986)	$ (28,256)
Other comprehensive (loss) income:
Net change in unrealized (loss) gain on available-for-sale marketable securities	0	0	(2)	7
Other comprehensive (loss) income	0	0	(2)	7
Comprehensive loss	$ (447)	$ (9,336)	$ (60,988)	$ (28,249)