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Stockholders' Equity (Deficit) - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 01, 2020
Mar. 31, 2020
Mar. 31, 2020
Jun. 30, 2020
Redeemable Convertible Preferred Stock [Member]        
Class of Stock [Line Items]        
Accretion to Redemption value       $ 0
Issuance of Series B redeemable convertible preferred stock     10,027,666  
Redeemable Stock Excersible On Agreed Upon Milestones [Member] | Redeemable Convertible Preferred Stock [Member]        
Class of Stock [Line Items]        
Issuance of Series B redeemable convertible preferred stock   21,732,862    
Proceeds from Issuance of Convertible Preferred Stock   $ 46,900    
Series B [Member] | Redeemable Convertible Preferred Stock [Member]        
Class of Stock [Line Items]        
Issuance of Series B redeemable convertible preferred stock   14,701,054    
Issuance of Series B redeemable convertible preferred stock for cash 10,669,834 4,673,388    
Issuance of Series B redeemable convertible preferred stock upon conversion of convertible notes   10,027,666    
Preferred stock, Par or Stated Value Per Share $ 2.16 $ 2.16 $ 2.16  
Proceeds from Issuance of Convertible Preferred Stock $ 23,000      
Proceed received in advance for issuance of common stock $ 12,000      
Series B [Member] | Redeemable Stock Excersible On Agreed Upon Milestones [Member]        
Class of Stock [Line Items]        
Proceeds from Issuance of Convertible Preferred Stock   $ 21,500