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Long Term Debt - Term Loan Balances (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long term debt $ 50,000  
Term loan | Hayfin Loan Agreement Term Loan    
Debt Instrument [Line Items]    
Outstanding principal 50,000 $ 50,000
Deferred financing costs (1,721) (1,996)
Original issue discount (264) (307)
Long term debt $ 48,015 $ 47,697