Quarterly report pursuant to Section 13 or 15(d)

Stock Option and Incentive Plans - Assumptions to Compute Fair Value of Stock Option Grants (Detail)

v3.21.2
Stock Option and Incentive Plans - Assumptions to Compute Fair Value of Stock Option Grants (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Risk free interest rate 0.85% 0.33% 0.84% 1.17%
Expected term (in years) 5 years 11 months 19 days 5 years 10 months 9 days 5 years 11 months 23 days 6 years 10 days
Expected volatility 94.30% 97.10% 94.50% 94.50%