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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total outstanding borrowings under the Credit Facility $ 76,438 $ 65,501
Less: current portion (2,812) (2,500)
Debt, less current portion 73,626 63,001
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under the Credit Facility 46,875 48,750
Revolving Credit Loan [Member]    
Debt Instrument [Line Items]    
Revolving Credit Loan 31,000 18,500
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount $ (1,437) $ (1,749)