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Related-Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 27, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]                
Payment to related party           $ 448,000 $ 2,180,000  
Amount due to related party   $ 0   $ 0   $ 0 10,000  
Number of shares issued as dividend payment   1,786,739            
Number of additional common stock outstanding owned by related party   2,534,239   2,534,239        
Percentage of common stock shares outstanding owned by related party   17.30%   17.30%        
Shares issued 1,786,739         42,415    
Share price   $ 16.36 $ 27.30 $ 16.36 $ 27.30      
Proceeds from notes receivable           $ 100,000    
Restricted Stock                
Related Party Transaction [Line Items]                
Shares issued               175,625
Share price               $ 13.64
Acquisition Targets | Selling, General and Administrative Expenses                
Related Party Transaction [Line Items]                
Payment to related party   $ 0 $ 100,000 $ 100,000 $ 400,000 $ 500,000 400,000  
Management Agreement [Member] | Selling, General and Administrative Expenses                
Related Party Transaction [Line Items]                
Payment to related party             $ 1,800,000