Annual report pursuant to Section 13 and 15(d)

Common Stock - Summary of Fair Value of Option Awards (Detail)

v3.6.0.2
Common Stock - Summary of Fair Value of Option Awards (Detail)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Risk-free interest rates 1.51% 1.76% 1.83%
Expected dividend yield 0.00% 0.00% 0.00%
Expected life 5 years 3 months 18 days 5 years 9 months 18 days 5 years 10 months 24 days
Expected volatility 72.00% 63.00% 82.00%