Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of share based compensation expense (Detail)

v3.20.2
Stock-Based Compensation - Summary of share based compensation expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 6,788 $ 31
Research and Development Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense 3,125 29
General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 3,663 $ 2