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Stockholders' Equity/(Deficit) - Stock Options Valuation Assumptions (Detail)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life of options 0 years  
Dividend yield   0.00%
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate   1.78%
Expected volatility of common stock   64.47%
Expected life of options   6 years 1 month 6 days
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate   2.00%
Expected volatility of common stock   65.95%
Expected life of options   8 years 2 months 12 days