Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Consolidated Statements of Comprehensive Loss
Net loss	$ (31,133)	$ (2,011)	$ (43,501)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation adjustment	95	(21)	(15)
Comprehensive loss	$ (31,038)	$ (2,032)	$ (43,516)