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Fair Value of Financial Instruments - Summary of Fair Value Assessment of Warrant Liability Inputs using Black Sholes Option Pricing Model (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2014
$ / shares
Dec. 31, 2014
$ / shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value of Series B/C/D Stock and Series E Stock shares on grant date or measurement date $ 0.13 $ 0.13
Expected risk-free interest rate 1.60% 1.20%
Expected volatility 75.00% 70.00%
Expected term 7 years 4 years 1 month 6 days
Expected dividend yield 0.00%  
Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value of Series B/C/D Stock and Series E Stock shares on grant date or measurement date $ 0.14 $ 0.14
Exercise price 0.01 $ 0.01
Expected dividend yield   0.00%
Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value of Series B/C/D Stock and Series E Stock shares on grant date or measurement date 0.22 $ 0.22
Exercise price $ 0.346 $ 0.346
Expected dividend yield   8.00%