Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Stock Options - Summary of Assumptions Used Principally in Determining Fair Value of Options Granted (Detail) - Stock Options [Member]
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk free interest rate 1.81% 1.86%
Expected dividend yield 0.00% 0.00%
Expected term in years 6 years 3 months 11 days 9 years 10 months 13 days
Expected volatility 88.30% 101.50%
Estimated forfeiture rate 5.00% 0.34%