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Fair Value of Financial Instruments - Narrative (Details) (Preferred Stock Warrant Liability [Member])
 1 Months Ended 12 Months Ended
Oct. 31, 2013
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Volatility rate 82.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate 82.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
Risk free interest rate 0.30%us-gaap_FairValueAssumptionsRiskFreeInterestRate 0.30%us-gaap_FairValueAssumptionsRiskFreeInterestRate
Minimum [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Time to maturity 1 year 8 months 14 days 1 year 2 months 29 days
Maximum [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Time to maturity 1 year 11 months 21 days 1 year 8 months 28 days