Description of Business and Basis of Presentation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of computation of basic and diluted net income (loss) per share
Net loss	$ (1,449)	$ (3,292)	$ (20,166)	$ (4,154)
Weighted-average common shares outstanding	31,529	29,284	30,440	29,146
Net loss per share
Basic and diluted (in dollars per share)	$ (0.05)	$ (0.11)	$ (0.66)	$ (0.14)