Net Income (Loss) per Common Share - Reconciliation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ 567	$ (4,684)	$ (42,309)	$ (16,094)
Weighted average common shares outstanding, basic	62,274,438	328,929	38,674,889	306,764
Add effect of dilutive securities:
Stock options	8,514,752
Common stock warrants	936,928
Shares used in computing diluted net income (loss) per common share	71,726,118	328,929	38,674,889	306,764
Net income (loss) per common share, basic	$ 0.01	$ (14.24)	$ (1.09)	$ (52.47)
Net income (loss) per common share, diluted	$ 0.01	$ (14.24)	$ (1.09)	$ (52.47)