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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 |
6 Months Ended | |
|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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| Summary of Significant Accounting Policies (Details) - Reconciliation of the warrant liability measured at fair value using Level 3 inputs [Line Items] | ||
| Balance at beginning of period | $ 939 | |
| Exercise of common stock warrants | 2,500 | |
| Remeasurement of common stock warrants | 1,682 | (6) |
| Balance at end of period | 1,647 | |
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Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
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| Summary of Significant Accounting Policies (Details) - Reconciliation of the warrant liability measured at fair value using Level 3 inputs [Line Items] | ||
| Balance at beginning of period | 939 | 10 |
| Issuance of common stock warrants | 1,531 | |
| Exercise of common stock warrants | (2,505) | |
| Remeasurement of common stock warrants | 1,682 | (6) |
| Balance at end of period | $ 1,647 | $ 4 |