Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Detail)

v3.19.3.a.u2
Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jul. 17, 2019
Jun. 11, 2019
Mar. 31, 2019
Related Party Transaction [Line Items]                
Due to related parties   $ 3,134   $ 3,134       $ 58
Roivant Sciences Ltd. (RSL) [Member]                
Related Party Transaction [Line Items]                
Due to related parties $ 2,500         $ 2,900 $ 5,000  
Prepayment of related party debt $ 2,500              
Due to related parties Other payables   200   200        
Convertible Promissory note converted, principal balance       $ 2,500        
Convertible Promissory note converted, shares issued       511,178        
Business combination shares exchanged       250,000        
Service Agreements [Member]                
Related Party Transaction [Line Items]                
Related party transaction, amounts   400 $ 600 $ 1,000 $ 2,000      
Partners capital contributions       100        
Service Agreements [Member] | Roivant Sciences Ltd. (RSL) [Member]                
Related Party Transaction [Line Items]                
Partners capital contributions   300   900        
Due to related parties   $ 200   $ 200