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DEBT - Note Payable (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
installment
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
installment
Debt Instrument [Line Items]          
Payment of notes payable     $ 2,426 $ 2,426  
Earnout Notes Payable          
Debt Instrument [Line Items]          
Notes payable     $ 2,500   $ 7,300
Number of installments | installment         3
Number of installments paid | installment     2    
Payment of notes payable $ 2,400 $ 2,400      
Stated interest rate (percent)     2.00%