Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Stock Option and Incentive Plans - Assumptions to Compute Fair Value of Stock Option Grants (Detail)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Risk free interest rate 1.35% 2.51%
Expected term (in years) 6 years 21 days 6 years 21 days
Expected volatility 94.00% 89.30%