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Revenues - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Revenue from contract with customer [Line Items]        
Deferred revenue $ 3,488   $ 3,488 $ 4,811
Long-term Contract [Member]        
Revenue from contract with customer [Line Items]        
Deferred revenue 1,148   1,148 1,595
Up Front Payment Arrangement [Member]        
Revenue from contract with customer [Line Items]        
Deferred revenue $ 2,340   $ 2,340 $ 3,216
Customer One [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]        
Revenue from contract with customer [Line Items]        
Percentage of concentration risk     13.00%  
Customer One [Member] | Net Consolidated Revenue [Member] | Customer Concentration Risk [Member]        
Revenue from contract with customer [Line Items]        
Percentage of concentration risk 14.00% 11.00%    
Customer Two [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]        
Revenue from contract with customer [Line Items]        
Percentage of concentration risk       11.00%
Customer Two [Member] | Net Consolidated Revenue [Member] | Customer Concentration Risk [Member]        
Revenue from contract with customer [Line Items]        
Percentage of concentration risk     10.00%