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Senior Debt - Summary of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Total outstanding borrowings under the Credit Facility $ 65,501 $ 74,456
Less: current portion (2,500)  
Debt, less current portion 63,001 74,456
Term Loan [Member]    
Debt Instrument [Line Items]    
Total outstanding borrowings under the Credit Facility 48,750 76,147
Revolving Credit Loan [Member]    
Debt Instrument [Line Items]    
Revolving Credit Loan 18,500  
Term Debt [Member]    
Debt Instrument [Line Items]    
Unamortized debt discount $ (1,749) $ (1,691)