Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Assumptions used in Estimating Common and Preferred Stock Warrant Liability (Details)

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Fair Value Measurements - Schedule of Assumptions used in Estimating Common and Preferred Stock Warrant Liability (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Common Stock
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Estimated fair value of common share $ 1.61 $ 5.75
Weighted-average risk free interest rate 1.19% 1.26%
Weighted-average expected life (in years) 3 years 4 months 24 days 4 years 1 month 6 days
Expected dividend yield 0.00% 0.00%
Weighted average expected volatility 35.00% 47.00%
Preferred Stock
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Estimated fair value of common share   $ 5.75
Weighted-average risk free interest rate   1.11%
Weighted-average expected life (in years)   3 years 7 months 6 days
Expected dividend yield   0.00%
Weighted average expected volatility   44.00%