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Related-Party Transactions - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]      
Amount due to related party $ 0 $ 0  
Number of shares issued as dividend payment 1,786,739    
Number of additional common stock outstanding owned by related party 2,534,239    
Proceeds from notes receivable   100,000  
Acquisition Targets | Selling, General and Administrative Expenses      
Related Party Transaction [Line Items]      
Payment to related party $ 100,000 $ 500,000 $ 400,000