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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($) customer	Dec. 31, 2018 USD ($) customer
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 81,862,453	$ 41,797,179	$ 33,274,702
Allowance for doubtful accounts	$ (125,000)
Customer Concentration Risk
Concentration risks
Number of significant customers | customer	2	3	2
Aggregate dollar amount of net sales to significant customers	$ 41,600,000	$ 19,000,000	$ 13,100,000
Percentage of net sales to significant customers	50.60%	45.60%	39.20%
Supplier Concentration Risk
Concentration risks
Percentage of net sales to significant customers	85.20%	82.60%	85.30%
Department of health and human
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 31,600,000
Contract receivables	$ 83,800,000

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