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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Significant Other Unobservable Inputs (Level 3) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Warrant Liability – Current |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning balance | $ 0
Issuances of warrants | 2,453
Reclass of liability from long-term to current | 1,846
Change in fair value - net | 2,643
Transfer in and out (exercise of warrants) | (5,201)
Expiration of warrants | (1,238)
Ending balance | 503
Warrant Liability – Long-Term |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning balance | 0
Issuances of warrants | 1,690
Reclass of liability from long-term to current | (1,846)
Change in fair value - net | (95)
Transfer in and out (exercise of warrants) | 251
Expiration of warrants | 0
Ending balance | 0
Warrant Liability – Total |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Beginning balance | 0
Issuances of warrants | 4,143
Reclass of liability from long-term to current | 0
Change in fair value - net | 2,548
Transfer in and out (exercise of warrants) | (4,950)
Expiration of warrants | (1,238)
Ending balance | $ 503

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