Basic and Diluted Net Income (Loss) Per Share - Earnings (Loss) Per Share Calculation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (4,469)	$ (12,720)	$ (23,114)	$ (23,389)
Interest on convertible notes, net of tax benefit	0	0	0	0
Net income (loss), diluted	$ (4,469)	$ (12,720)	$ (23,114)	$ (23,389)
Weighted average shares used to calculate net income (loss) per share, basic	36,332	28,931	34,097	28,692
Effect of escrow shares	0	0	0	0
Effect of convertible notes	0	0	0	0
Weighted average shares used to calculate net income (loss) per share, diluted	36,332	28,931	34,097	28,692
Basic (in dollars per share)	$ (0.12)	$ (0.44)	$ (0.68)	$ (0.82)
Diluted (in dollars per share)	$ (0.12)	$ (0.44)	$ (0.68)	$ (0.82)
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards	0	0	0	0
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards	0	0	0	0