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Accounts Receivable - Accounts Receivable (Detail) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Receivables [Abstract]    
Trade accounts receivable $ 2,177,803 $ 1,550,845
Less allowance for bad debts (29,447) (29,712)
Accounts receivable, net $ 2,148,356 $ 1,521,133