Accounts Receivable (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Components of accounts receivable
Accounts receivable	$ 12,080,586	$ 13,855,040
Less: allowance for doubtful accounts	(11,051,884)	(9,527,060)
Accounts receivable, net	$ 1,028,702	$ 4,327,980

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant