Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (10,252)	$ (12,387)	$ (19,574)	$ (27,270)
Other comprehensive loss:
Cumulative translation loss			(19)
Comprehensive loss	$ (10,252)	$ (12,387)	$ (19,593)	$ (27,270)