Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule of fair value assumptions (Detail)

v3.20.2
Stock-Based Compensation - Schedule of fair value assumptions (Detail)
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 0.51% 2.38%
Expected term, in years 5 years 9 months 6 years 14 days
Expected volatility 74.69% 74.79%
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 2.25% 2.97%
Expected term, in years 6 years 1 month 9 days 6 years 25 days
Expected volatility 77.93% 75.11%