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Long-Term Debt - Summary of Long-Term Debt (Detail) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Total debt $ 249,500,000 $ 252,000,000
Less unamortized debt issuance costs (8,739,497) (9,223,480)
Long-term debt 240,760,503 242,776,520
Long-term debt, net of current portion 240,760,503 242,776,520
Term Loan [Member]    
Line of Credit Facility [Line Items]    
Total debt $ 249,500,000 $ 252,000,000