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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Capital lease obligations $ 566,854 $ 630,874
Long-term debt, including capital lease obligations 252,566,854 225,630,874
Less unamortized debt issuance costs (9,223,480) (10,850,972)
Long-term debt 243,343,374 214,779,902
Long-term debt 243,343,374 214,779,902
Less current installments (67,101) (2,314,020)
Long-term debt, net of current portion 243,276,273 212,465,882
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Long-term debt $ 252,000,000 $ 225,000,000