CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 30,473	$ (18,853)	$ (6,505)
Change in cumulative foreign currency translation adjustment	(4,195)	10,695	(1,049)
Total comprehensive income (loss)	$ 26,278	$ (8,158)	$ (7,554)