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Summary of Significant Accounting Policies (Details) - Reconciliation of the warrant liability measured at fair value using Level 3 inputs (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | |
|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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| Reconciliation of the warrant liability measured at fair value using Level 3 inputs [Abstract] | ||
| Balance at beginning of period | $ 939 | $ 10 |
| Issuance of common stock warrants | 1,531 | 749 |
| Exercise of common stock warrants | (2,505) | |
| Remeasurement of common stock warrants | 945 | 151 |
| Balance at end of period | $ 910 | $ 910 |