Annual report pursuant to Section 13 and 15(d)

Accounts receivable, net (Details)

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Accounts receivable, net (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable $ 49,460,347 $ 38,211,951
Less: allowance for doubtful accounts 3,179,578 2,072,085
Accounts receivable, net $ 46,280,769 $ 36,139,866