Net Income Per Share - Computation of Basic and Diluted 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
Numerator:
Net income (loss)	$ (7,187)	$ 1,378	$ (2,201)	$ 3,269
Denominator:
Basic	42,038	40,367	41,589	36,303
Dilutive effect of equity awards		1,850		1,234
Diluted	42,038	42,217	41,589	37,537
Basic net income (loss) per share	$ (0.17)	$ 0.03	$ (0.05)	$ 0.09
Diluted net income (loss) per share	$ (0.17)	$ 0.03	$ (0.05)	$ 0.09