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Business Combinations - Additional Information (Details)
9 Months Ended 12 Months Ended
Oct. 01, 2020
USD ($)
contact_center
May 04, 2020
USD ($)
Sep. 30, 2021
USD ($)
company
Dec. 31, 2020
USD ($)
company
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]            
Number of businesses acquired | company     0 2    
Contingent liability     $ 2,563,000 $ 0 $ 0 $ 10,095,000
Contingent Accrued Earn-out Acquisition Consideration            
Business Acquisition [Line Items]            
Contingent liability     $ 2,600,000 $ 0    
Trimax            
Business Acquisition [Line Items]            
Payments to acquire businesses   $ 9,900,000        
Preferred interest, term   5 years        
Maximum value of preferred interest   $ 9,900,000        
Asure Edge            
Business Acquisition [Line Items]            
Payments to acquire businesses $ 5,000,000          
Ownership percentage 70.00%          
Number of contact centers | contact_center 6