Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3.a.u2
Stock-Based Compensation - Schedule of fair value assumptions (Detail)
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate   2.97%   2.97%
Expected term, in years   6 years 14 days   6 years 14 days
Expected volatility   74.79%   74.79%
Expected dividend yield    
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 1.61%   1.61%  
Expected term, in years 5 years 11 months 19 days   5 years 9 months  
Expected volatility 75.55%   74.69%  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 1.78%   2.25%  
Expected term, in years 6 years 1 month 9 days   6 years 1 month 9 days  
Expected volatility 76.01%   76.01%