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Acquisitions of Businesses, 2019 Acquisition (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
Clinic
Installment
Apr. 11, 2019
USD ($)
State
Location
Dec. 31, 2021
USD ($)
Clinic
Dec. 31, 2020
USD ($)
Clinic
Dec. 31, 2019
USD ($)
Business Combination, Description [Abstract]          
Number of clinics | Clinic     5 3  
Cash paid, net of cash acquired     $ 86,823 $ 23,907 $ 30,597
September 2019 Acquisition [Member]          
Business Combination, Description [Abstract]          
Percentage of interest acquired 67.00%   67.00%    
Number of clinics | Clinic 11   11    
Cash paid, net of cash acquired $ 12,300        
Aggregate purchase price for the acquisition 12,400        
Cash acquired 200        
Cash paid for acquisition 12,600        
Seller notes $ 300        
Number of installments | Installment 2        
Percentage of interest accrued 5.00%        
September 2019 Acquisition [Member] | September 2020 [Member]          
Business Combination, Description [Abstract]          
Cash paid for acquisition $ 150        
September 2019 Acquisition [Member] | September 2021 [Member]          
Business Combination, Description [Abstract]          
Cash paid for acquisition $ 150        
April 2019 Acquisition [Member]          
Business Combination, Description [Abstract]          
Number of states of network services | State   45      
Number of onsite client locations | Location   11      
Percentage of interest acquired   76.00%      
Cash paid, net of cash acquired   $ 18,900      
Aggregate purchase price for the acquisition   23,600      
Cash acquired   700      
Cash paid for acquisition   22,900      
Payable to shareholders of seller   500      
Seller notes   $ 4,000      
Percentage of interest accrued   5.50%