Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (1,174)	$ (2,438)	$ (6,410)	$ (9,349)
Other comprehensive (loss) income, net of tax:
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	0	2	1	(1)
Foreign currency translation adjustment	(763)	1,956	(2,185)	4,997
Unrealized gain on derivative instruments, net	12	19	49	64
Other comprehensive (loss) income, net of tax(1)	(751)	1,977	(2,135)	5,060
Total comprehensive loss	$ (1,925)	$ (461)	$ (8,545)	$ (4,289)