Schedule of Basic and Diluted Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ (7,290)	$ 3,428	$ (13,278)	$ 1,704
Weighted average shares of common stock outstanding	61,501	58,753	61,263	57,441
Dilutive effect of employee stock options and restricted stock awards		2,695		2,424
Shares used to compute diluted net income per share	61,501	61,448	61,263	59,865
Basic	$ (0.12)	$ 0.06	$ (0.22)	$ 0.03
Diluted	$ (0.12)	$ 0.06	$ (0.22)	$ 0.03