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Fair Value Measurements - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Fair value assumption, volatility rate     80.00%   66.00%
Fair value assumption, risk free rate     0.17%   0.325%
Fair value assumption, credit spread     7.92%   7.40%
Gain (loss) from valuation of convertible note payable $ 1,785 $ 671 $ 614 $ (3,787)  
Effect of 10% increase or decrease in volatility on estimated fair value of convertible note payable     2.00%    
Historical Volatility
         
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Fair value assumption, volatility rate     40.00%    
Implied Volatility
         
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Fair value assumption, volatility rate     60.00%