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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) customer	Jun. 30, 2019 USD ($) customer	Jun. 30, 2020 USD ($) customer	Jun. 30, 2019 USD ($) customer
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 11,573,845	$ 9,595,890	$ 22,776,062	$ 17,528,364
Aggregate Delivery Order Value	$ 83,800,000
Customer Concentration Risk
Concentration risks
Number of significant customers | customer	4	3	2	3
Aggregate dollar amount of net sales to significant customers	$ 6,000,000	$ 4,000,000	$ 6,900,000	$ 7,900,000
Percentage of net sales to significant customers	52.10%	42.70%	30.20%	45.40%
Supplier Concentration Risk
Concentration risks
Percentage of net sales to significant customers	85.00%	84.10%	83.50%	80.50%
Department of health and human
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 1,400,000

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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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