Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
Common Stock - Summary of Fair Value of Option Awards (Detail)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Risk-free interest rates 1.76% 1.81%
Expected dividend yield 0.00% 0.00%
Expected life 5 years 9 months 18 days 5 years 10 months 24 days
Expected volatility 62.00% 81.00%