Condensed Consolidated Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (8,805)	$ (12,007)	$ (12,269)	$ (28,223)
Other comprehensive income, net of tax:
Foreign currency translation adjustment	1,022	2,113	1,191	3
Net change in unrealized gains on investments	13	282	185	57
Other comprehensive income, net of tax	1,035	2,395	1,376	60
Total comprehensive loss	$ (7,770)	$ (9,612)	$ (10,893)	$ (28,163)