Summary of Significant Accounting Policies - Fair Value (Details) - 6 months ended Jun. 30, 2015 - USD ($)
$ in Thousands |
Total |
| Stock Option Liability Awards |
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
| Balance as of beginning of period |
$ 461
|
| Change in fair value |
(173)
|
| Reclassification of liabilities to equity |
(288)
|
| Balance as of end of period |
$ 0
|
| Assumptions used for estimating fair value |
|
| Dividend yield |
0.00%
|
| Stock Option Liability Awards | Minimum |
|
| Assumptions used for estimating fair value |
|
| Risk-free interest rate |
1.46%
|
| Expected term (years) |
4 years 8 months 27 days
|
| Expected volatility |
51.00%
|
| Stock Option Liability Awards | Maximum |
|
| Assumptions used for estimating fair value |
|
| Risk-free interest rate |
1.67%
|
| Expected term (years) |
6 years 11 days
|
| Expected volatility |
53.00%
|
| Lender Warrants | Amended Mezzanine Loan and Security Agreement |
|
| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
|
| Balance as of beginning of period |
$ 1,615
|
| Change in fair value |
(482)
|
| Reclassification of liabilities to equity |
(1,133)
|
| Balance as of end of period |
$ 0
|
| Assumptions used for estimating fair value |
|
| Risk-free interest rate |
1.97%
|
| Expected term (years) |
9 years 4 months 2 days
|
| Expected volatility |
58.00%
|
| Dividend yield |
0.00%
|