Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (12,921)	$ (8,450)	$ (39,118)	$ (37,710)
Other comprehensive income (loss):
Foreign currency translation adjustment, net of taxes	(2,049)	81	(1,756)	(2,570)
Total comprehensive loss	$ (14,970)	$ (8,369)	$ (40,874)	$ (40,280)