Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (17,716)	$ (11,100)
Other comprehensive loss:
Foreign currency translation adjustment	(1,077)	(304)
Changes in unrealized gain on investments, net of income taxes of $0 for the three months ended March 31, 2020 and $113 thousand for the three months ended March 31, 2019	583	426
Comprehensive loss	$ (18,210)	$ (10,978)