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 Income And Comprehensive Income [Abstract]
Net loss	$ (11,255)	$ (10,370)	$ (30,829)	$ (37,640)
Other comprehensive loss:
Cumulative translation loss		(1)	(19)	(1)
Comprehensive loss	$ (11,255)	$ (10,371)	$ (30,848)	$ (37,641)