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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) customer	Sep. 30, 2018 USD ($) customer	Sep. 30, 2019 USD ($) customer	Sep. 30, 2018 USD ($) customer
Concentration risks
Sales, net	$ 11,639,586	$ 9,863,272	$ 29,167,950	$ 25,011,066
Supplier Concentration Risk
Concentration risks
Concentration risk (as a percent)	84.20%	79.90%	82.10%	85.10%
Sales | Customer Concentration Risk
Concentration risks
Number of significant customers | customer	3	3	3	2
Sales, net	$ 5,000,000	$ 5,400,000	$ 12,600,000	$ 10,000,000
Concentration risk (as a percent)	43.20%	55.20%	43.30%	39.90%

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Represents the number of significant customers.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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