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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item
Concentration risks
Number of significant customers | item	2	2	1
Aggregate dollar amount of net sales to significant customers	$ 33,274,702	$ 34,493,838	$ 29,826,636
Customer Concentration Risk
Concentration risks
Decrease in allowance for doubtful accounts		48,000,000
Sales | Customer Concentration Risk
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 13,100,000	$ 14,000,000	$ 9,400,000
Percentage of net sales to significant customers (as a percent)	39.20%	40.50%	31.40%
Cost of Goods, Product Line | Supplier Concentration Risk
Concentration risks
Percentage of net sales to significant customers (as a percent)	85.30%	82.90%	78.40%

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Represents the number of significant customers.

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Amount of increase (decrease) in the allowance for doubtful accounts.

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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.

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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.

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