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Fair Value Measurements - Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Details) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2014
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Dec. 31, 2013
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|---|---|---|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | $ 319 | $ 210 |
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Fair Value, Measurements, Recurring | Portion at Fair Value Measurement
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | 319 | 210 |
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Fair Value, Measurements, Recurring | Portion at Fair Value Measurement | Level 3
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | 319 | 210 |
|
Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | 11 | |
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Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement | Level 1
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | ||
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Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement | Level 2
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | ||
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Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement | Level 3
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | 11 | |
|
Fair Value, Measurements, Recurring | Common Stock | Portion at Fair Value Measurement
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | 319 | 199 |
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Fair Value, Measurements, Recurring | Common Stock | Portion at Fair Value Measurement | Level 3
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| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] | ||
| Warrant liability | $ 319 | $ 199 |