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Schedule I - Valuation and Qualifying Accounts (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts (Deducted from Accounts Receivable) [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Period $ 1,623,408 $ 1,537,353
Charged to Costs and Expenses 2,842,941 1,471,875
Deductions 2,455,628 1,385,820
Balance at End of Period 2,010,721 1,623,408
Valuation Allowance for Deferred Tax Assets [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Period 328,170 528,179
Charged to Costs and Expenses 3,446,579 36,794
Deductions 14,295 236,803
Balance at End of Period $ 3,760,454 $ 328,170