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Credit Facility - Additional information (Detail) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Jan. 04, 2022
Oct. 01, 2020
Aug. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Line of Credit Facility [Line Items]                
Current borrowing capacity under line of credit facility       $ 24,800,000     $ 31,800,000  
Deferred financing costs       238,000     293,000  
Repayments of debt       1,100,000 $ 10,900,000      
Term Loan Facility [Member]                
Line of Credit Facility [Line Items]                
Outstanding borrowings amount       0     1,100,000  
Revolving Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Percentage of eligible accounts receivable           85.00%    
Outstanding borrowings amount       $ 0     0  
Revolving Line of Credit [Member] | United States [Member]                
Line of Credit Facility [Line Items]                
Percentage of eligible unbilled accounts           60.00%    
Revolving Line of Credit [Member] | Canada [Member]                
Line of Credit Facility [Line Items]                
Credit facility maximum borrowing capacity           $ 10,000,000    
Percentage of eligible accounts receivable           85.00%    
Percentage of eligible unbilled accounts           60.00%    
Revolving Line of Credit [Member] | Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Credit facility maximum borrowing capacity           $ 5,000,000    
Revolving Line of Credit [Member] | Swing Loans [Member]                
Line of Credit Facility [Line Items]                
Credit facility maximum borrowing capacity           $ 6,000,000    
Federal Funds Rate [Member]                
Line of Credit Facility [Line Items]                
Basis spread on variable rate       0.50%        
PNC Bank, N.A. [Member]                
Line of Credit Facility [Line Items]                
Credit facility maximum borrowing capacity             $ 53,100,000  
Payment of deferred financing costs   $ 975,000            
PNC Bank, N.A. [Member] | Term Loan Facility [Member]                
Line of Credit Facility [Line Items]                
Credit facility maximum borrowing capacity               $ 13,100,000
Credit facility, periodic payment   1,100,000            
Repayments of debt     $ 7,600,000          
Line of credit facility outstanding amount       $ 0        
PNC Bank, N.A. [Member] | Revolving Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Credit facility maximum borrowing capacity   $ 40,000,000            
Maximum [Member]                
Line of Credit Facility [Line Items]                
Revolving credit facility percentage margin over base rate           1.25%    
Term loan percentage margin over base rate           2.50%    
Revolving credit facility percentage margin adjusted LIBOR rate           2.25%    
Term loan percentage margin adjusted LIBOR rate           3.50%    
Maximum [Member] | PNC Bank, N.A. [Member] | Revolving Line of Credit [Member]                
Line of Credit Facility [Line Items]                
Credit facility additional borrowing capacity upon certain conditions $ 20,000,000              
Minimum [Member]                
Line of Credit Facility [Line Items]                
Revolving credit facility percentage margin over base rate           0.50%    
Term loan percentage margin over base rate           1.75%    
Revolving credit facility percentage margin adjusted LIBOR rate           1.50%    
Term loan percentage margin adjusted LIBOR rate           2.75%