Net Income (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Net income (loss)	$ (4,902)	$ 1,178	$ (14,772)	$ (951)
Denominator
Weighted average shares of common stock outstanding used in computing net income (loss) per share, basic (shares)	39,493,665	38,649,873	39,391,259	38,517,817
Dilutive effect of incremental shares and share equivalents (shares)	0	2,991,787	0	0
Weighted average shares of common stock outstanding used in computing net income (loss) per share, diluted (shares)	39,493,665	41,641,660	39,391,259	38,517,817
Net income (loss) per share:
Net income (loss) per share, basic (usd per share)	$ (0.12)	$ 0.03	$ (0.38)	$ (0.02)
Net income (loss) per share, diluted (usd per share)	$ (0.12)	$ 0.03	$ (0.38)	$ (0.02)