Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (27,712)	$ (38,624)
Change in unrealized loss on available-for-sale debt securities	(74)	(61)
Comprehensive loss	$ (27,786)	$ (38,685)