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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2019
Jul. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
[1]
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Aug. 31, 2019
Related Party Transaction [Line Items]                    
Related party transaction, amounts     $ 200   $ 300   $ 500 $ 700    
Due to related parties     134       134   $ 3,190  
Business combination number of shares exchanged 250,000                  
Roivant Sciences Ltd. (RSL)                    
Related Party Transaction [Line Items]                    
Related party transaction, amounts     100       200 100    
Capital contribution – expenses allocated from Roivant Sciences Ltd.     53 $ 164 220 $ 331 [1]        
Due to related parties $ 2,500 $ 2,900     2,500 $ 5,000   2,500   $ 5,000
Promissory note term   180 days                
Roivant Sciences Ltd. (RSL) | Capital Contributions                    
Related Party Transaction [Line Items]                    
Capital contribution – expenses allocated from Roivant Sciences Ltd.     $ 100   $ 300   $ 300 $ 600    
[1] Retroactively restated for reverse recapitalization as described in Note 1.