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Fair Value - Summary of Fair Value Assessment of Warrant Liability Inputs using Black Sholes Option Pricing Model (Details) - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 30, 2014
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
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]      
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]      
Exercise price 0.346 $ 0.346  
Expected dividend yield   8.00%  
Series B/C/D Stock and Series E Stock shares | 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  
Series B/C/D Stock and Series E Stock shares | 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