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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) customer	Mar. 31, 2018 USD ($) customer
Concentration risks
Number of significant customers | customer	3	4
Aggregate dollar amount of net sales to significant customers	$ 7,932,474	$ 7,672,801
Sales | Customer Concentration Risk
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 3,900,000	$ 4,900,000
Percentage of net sales to significant customers (as a percent)	48.60%	63.30%
Cost of Goods, Product Line | Supplier Concentration Risk
Concentration risks
Percentage of net sales to significant customers (as a percent)	76.10%	83.90%

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- Definition

Represents the number of significant customers.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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