Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,854)	$ (2,628)	$ (9,360)	$ (5,265)
Other comprehensive income (loss):
Foreign currency translation adjustments	380	(111)	496	318
Unrealized gains (losses) from marketable securities, net of tax	0	(5)	1	(8)
Total other comprehensive income (loss)	380	(116)	497	310
Comprehensive loss	$ (6,474)	$ (2,744)	$ (8,863)	$ (4,955)