Description of Business and Basis of Presentation (Net Loss per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of computation of basic and diluted net income (loss) per share
Net loss	$ (6,848)	$ (9,341)
Weighted-average common shares outstanding	31,650	29,445
Net loss per share
Basic and diluted (in dollars per share)	$ (0.22)	$ (0.32)