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Schedule I - Valuation and Qualifying Accounts (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts (Deducted from Accounts Receivable) [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Period $ 596,380 $ 544,932
Charged to Costs and Expenses 2,061,553 695,246
Deductions 1,120,580 643,798
Balance at End of Period 1,537,353 596,380
Valuation Allowance for Deferred Tax Assets [Member]    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at Beginning of Period 594,079 630,775
Charged to Costs and Expenses 69,867  
Deductions 135,767 36,696
Balance at End of Period $ 528,179 $ 594,079