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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Mar. 31, 2019
Subsidiary or Equity Method Investee [Line Items]        
Preferred stock, par value     $ 0.0001 $ 0.0001
Preferred stock, shares authorized     10,000,000 0
Preferred stock, shares issued     0  
Preferred stock, shares outstanding     0  
Common Stock, Shares Authorized     500,000,000 489,066,238
Number of securities called by warrants or rights 5,750,000   5,750,000  
IPO [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Exercise price of warrant     $ 11.50  
Warrants Outstanding     11,500,000  
Common stock, sale price     $ 16.50  
Number of securities called by warrants or rights     5,750,000  
Redemption price per warrant     $ 0.01  
Private Placement [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Issuance of common shares, net, shares 10,000,000      
Exercise price of warrant $ 11.50      
Generating gross proceeds of private placement warrants $ 5.0      
Preferred Stock [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Preferred stock, par value     $ 0.0001  
Preferred stock, shares authorized     10,010,000  
Common Stock [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Common Stock, Shares Authorized     500,000,000  
Common stock par value     $ 0.0001  
Issuance of common shares, net, shares   1,273,609    
Warrant [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Warrants expiration date     Dec. 31, 2024  
Warrant [Member] | IPO [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Number of securities called by warrants or rights 5,750,000      
Minimum [Member] | IPO [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Common stock, sale price $ 0.50      
Series A Preferred Stock [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Preferred stock, par value     $ 0.0001 $ 0.0001
Preferred stock, shares authorized     10,000 0
Preferred stock, shares issued     10,000  
Preferred stock, shares outstanding     10,000  
Percentage of voting power of outstanding shares     25.00%  
Liquidation Amount Per Share     $ 0.01  
Series A Preferred Stock [Member] | Roivant Sciences Ltd. [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Preferred stock, par value     $ 0.0001  
Preferred stock, shares issued     10,000  
Two Series A Preferred Stock [Member] | Minimum [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Percentage of voting power of outstanding shares     25.00%  
Two Series A Preferred Stock [Member] | Maximum [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Percentage of voting power of outstanding shares     40.00%  
Three Series A Preferred Stock [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Percentage of voting power of outstanding shares     40.00%  
Four Series A Preferred Stock Member [Member]        
Subsidiary or Equity Method Investee [Line Items]        
Percentage of voting power of outstanding shares     50.00%