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INDEBTEDNESS - Credit facility (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Current debt $ 15,927   $ 13,243
Borrowing repayment $ 0 $ 7,500  
Senior Secured Credit Facility [Member]      
Debt Instrument, Term 5 years    
Commitment fee (as a percent) 0.40%    
Senior Secured Credit Facility [Member] | LIBOR [Member]      
Basis spread (as a percent) 2.00%    
Senior Secured Credit Facility [Member] | LIBOR [Member] | Minimum      
Basis spread (as a percent) 1.50%    
Senior Secured Credit Facility [Member] | LIBOR [Member] | Maximum      
Basis spread (as a percent) 2.75%    
Senior Secured Credit Facility [Member] | Alternative Base Rate [Member] | Minimum      
Basis spread (as a percent) 0.50%    
Senior Secured Credit Facility [Member] | Alternative Base Rate [Member] | Maximum      
Basis spread (as a percent) 1.75%    
Senior Secured Credit Facility [Member] | Term Loan [Member]      
Maximum borrowing capacity $ 72,200    
Quarterly payment 6,800    
Current debt 6,800    
Senior Secured Credit Facility [Member] | Delayed Draw Term Loan [Member]      
Maximum borrowing capacity 118,000    
Quarterly payment 9,600    
Current debt 9,600    
Senior Secured Credit Facility [Member] | Revolver [Member]      
Maximum borrowing capacity 75,000    
Amount borrowed 31,500    
Remaining borrowing capacity $ 43,500    
Senior Secured Credit Facility [Member] | Revolver [Member] | Minimum      
Commitment fee (as a percent) 0.25%    
Senior Secured Credit Facility [Member] | Revolver [Member] | Maximum      
Commitment fee (as a percent) 0.50%