Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax Disclosure [Abstract] | |||
| Tax at federal statutory rate | $ (27,173) | $ (29,220) | $ (21,142) |
| State statutory rate (net of federal benefit) | (1,560) | (1,728) | (1,921) |
| Non-deductible stock compensation | 2,334 | (19) | 619 |
| Change in valuation allowance | 24,332 | 30,571 | 22,184 |
| Other | 2,067 | 396 | 260 |
| Income Tax Expense (Benefit) | $ 0 | $ 0 | $ 0 |