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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) customer	Jun. 30, 2020 USD ($) customer	Jun. 30, 2021 USD ($) customer	Jun. 30, 2020 USD ($) customer
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 42,496,944	$ 11,573,845	$ 92,570,669	$ 22,776,062
Customer Concentration Risk
Concentration risks
Number of significant customers | customer	1	4	1	2
Aggregate dollar amount of net sales to significant customers	$ 27,400,000	$ 6,000,000.0	$ 65,100,000	$ 6,900,000
Customer Concentration Risk | Revenue Benchmark [Member] | Department of Health and Human Services
Concentration risks
Percentage of net sales to significant customers	64.40%	52.10%	70.40%	30.20%
Supplier Concentration Risk | China
Concentration risks
Concentration risk, geographic	90.6%	85.0%	90.4%	83.5%
Department of health and human
Concentration risks
Aggregate dollar amount of net sales to significant customers			$ 65,100,000

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Description of risks that arise due to concentrations of operating facilities, revenues, assets, customers, vendors or the like in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures)..

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