Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plan - Summary of Assumptions Used to Estimate the Fair Value of Stock Options Granted (Detail)

v3.6.0.2
Stock Compensation Plan - Summary of Assumptions Used to Estimate the Fair Value of Stock Options Granted (Detail)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Expected life of options 10 years 10 years
Expected dividend yield 0.00% 0.00%
Weighted-average expected volatility, minimum 142.00% 147.00%
Weighted-average expected volatility, maximum 147.00% 149.00%
Weighted-average risk-free interest rate, minimum 1.59% 2.14%
Weighted-average risk-free interest rate, maximum 2.40% 2.27%