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Accounts Receivable - Accounts Receivable, Net of Allowances for Sales Returns and Doubtful Accounts (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade accounts receivable $ 4,089,042 $ 4,333,608
Less allowances
Total accounts receivable, net $ 4,089,042 $ 4,333,608