Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 520	$ (1,498)	$ (8,638)	$ (5,793)
Other comprehensive gain (loss), net of tax
Unrealized gain (loss) on marketable securities	(119)	4	(78)	12
Comprehensive income (loss)	$ 401	$ (1,494)	$ (8,716)	$ (5,781)