Annual report pursuant to Section 13 and 15(d)

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

v3.20.1
Common Stock - Summary of Fair Value of Option Awards (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Risk-free interest rates 2.52% 2.93%
Expected dividend yield 0.00% 0.00%
Expected life 5 years 11 months 19 days 5 years 8 months 4 days
Expected volatility 94.25% 88.23%