Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Common Stock - Summary of Fair Value of Option Awards (Detail)
12 Months Ended
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Risk-free interest rates 1.95%
Expected dividend yield 0.00%
Expected life 6 years
Expected volatility 86.06%