Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net (loss)	$ (17,388)	$ (12,380)	$ (17,725)
Other comprehensive (loss):
Foreign currency translation adjustments	(6)	(1,097)	(489)
Unrealized (losses)/gains from marketable securities, net of tax	(6)	(11)	4
Total other comprehensive (loss)	(12)	(1,108)	(485)
Comprehensive (loss)	$ (17,400)	$ (13,488)	$ (18,210)