Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (22,438)	$ (4,053)
Other comprehensive income:
Unrealized gain on available-for-sale debt securities		106
Total comprehensive loss	$ (22,438)	$ (3,947)