Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Summary of Assumptions Used Principally in Determining Fair Value of Options Granted (Detail)

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Stock Options - Summary of Assumptions Used Principally in Determining Fair Value of Options Granted (Detail) (Stock Options [Member])
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk free interest rate 1.97% 1.19%
Expected dividend yield 0.00% 0.00%
Estimated term in years 6 years 3 months 6 years 3 months
Expected volatility 91.51% 91.95%
Estimated forfeiture rate 20.00% 20.00%