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Fair Value Measurements and Marketable Securities - Schedule of Assumptions used in Estimating Common and Preferred Stock Warrant Liability (Details) (USD $)
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12 Months Ended | |
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Dec. 31, 2014
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Dec. 31, 2013
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| Common Stock | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] | ||
| Estimated fair value of common share |
$ 0.80us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
$ 5.75us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
| Weighted-average risk free interest rate |
1.53%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
1.26%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
| Weighted-average expected life (in years) | 4 years 8 months 12 days | 4 years 1 month 6 days |
| Expected dividend yield |
0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
| Weighted average expected volatility |
116.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
47.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
| Preferred Stock | ||
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] | ||
| Estimated fair value of common share |
$ 5.75us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
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| Weighted-average risk free interest rate |
1.11%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
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| Weighted-average expected life (in years) | 3 years 7 months 6 days | |
| Expected dividend yield |
0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
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| Weighted average expected volatility |
44.00%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |
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- Details
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- Definition
Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average expected volatility of stock price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Price of a single share of a number of saleable stocks of a company. No definition available.
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- Details
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