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Preferred Units and Associated Call Right Liability - Additional Information (Detail) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class Of Stock [Line Items]          
Conversion of stock description     Ten for one    
Proceeds from issuance of common stock, gross $ 49,200,000        
Issuance costs 100,000        
Proceeds from issuance of common stock, net 48,400,000 $ 60,482,000      
Profits interests using option pricing model approach 700,000        
Fair value of call right liability 0        
Decrease to call right liability       $ 300,000  
Series A-1          
Class Of Stock [Line Items]          
Conversion price     $ 0.2885    
Temporary equity redemption price per share     0.2885    
Series A-2          
Class Of Stock [Line Items]          
Conversion price     0.4078    
Temporary equity redemption price per share     $ 0.4078    
Purchase units     36,782,737    
Purchase price per units     $ 0.4078    
Series A-3          
Class Of Stock [Line Items]          
Conversion price     0.6392    
Temporary equity redemption price per share     $ 0.6392    
Purchase units     23,466,834    
Purchase price per units     $ 0.6392    
Series A-4          
Class Of Stock [Line Items]          
Conversion price     0.9834    
Temporary equity redemption price per share     $ 0.9834    
Purchase units     15,253,203    
Purchase price per units     $ 0.9834    
Series A4B          
Class Of Stock [Line Items]          
Conversion price     0.9834    
Temporary equity redemption price per share     0.9834    
Series A-5          
Class Of Stock [Line Items]          
Conversion price     1.10    
Temporary equity redemption price per share     $ 1.10    
Stock issued $ 44,739,689        
Stock price per unit $ 1.10        
Stock issued value         $ 300,000
Class C Common Units          
Class Of Stock [Line Items]          
Stock issued $ 4,509,750        
Proceeds from issuance of common stock, net       $ 720,000