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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Inventory Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 371,332 $ 371,332 $ 367,558
Charged (credited) to expenses     3,774
Charged (credited) to other accounts (251,023)    
Deductions (120,309)    
Balance at ending of year   371,332 371,332
Accounts Receivable Reserve [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 4,631,593 5,131,593 4,820,593
Charged (credited) to expenses     500,000
Charged (credited) to other accounts (2,315,796)    
Deductions   500,000 189,000
Balance at ending of year $ 2,315,797 $ 4,631,593 $ 5,131,593