Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Fair Value of Each Stock Award for Employees and Directors (Detail)

v3.21.1
Common Stock - Summary of Fair Value of Each Stock Award for Employees and Directors (Detail)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Risk-free interest rates 0.59% 1.51%
Expected dividend yield 0.00% 0.00%
Expected life 6 years 3 days 6 years 7 days
Expected volatility 109.87% 104.06%