CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - 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	$ (6,510)	$ (13,053)	$ (12,824)	$ (33,108)
Other comprehensive income:
Foreign currency translation adjustments	449	880	77	372
Total comprehensive loss	$ (6,061)	$ (12,173)	$ (12,747)	$ (32,736)