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Fair Value Measurements, Warrant Liabilities, Changes in Level 3, and Outstanding Debt (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants | $ (3,088) | $ (2,526) |
Warrant Liabilities [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance | 31,828 |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants | (3,088) |  |
Net increase in estimated fair value of contingent warrant liabilities upon revaluation | 216 |  |
Ending balance | $ 28,956 |  | $ 31,828
Warrant Liabilities [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Expected volatility (in hundredths) | 69.80% |  | 69.60%
Risk-free interest rate (in hundredths) | 0.29% |  | 0.03%
Expected term | 1 year 5 months 8 days |  | 1 month 2 days
Warrant Liabilities [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |  |
Expected volatility (in hundredths) | 70.90% |  | 72.90%
Risk-free interest rate (in hundredths) | 0.69% |  | 0.67%
Expected term | 1 year 8 months 8 days |  | 2 years 2 months 8 days
Carrying Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest bearing obligations | $ 48,004 |  | $ 35,308
Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest bearing obligations | $ 49,686 |  | $ 36,461

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