Description of Business and Basis of Presentation (Net Income (Loss) per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net loss	$ (6,855)	$ (1,449)	$ (11,536)	$ (20,166)
Weighted average common shares outstanding	31,989	31,529	31,828	30,440
Net loss per share
Basic and diluted (in dollars per share)	$ (0.21)	$ (0.05)	$ (0.36)	$ (0.66)