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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) customer	Sep. 30, 2019 USD ($) customer	Sep. 30, 2020 USD ($) customer	Sep. 30, 2019 USD ($) customer
Concentration risks
Sales, net	$ 27,091,064	$ 11,639,586	$ 49,867,126	$ 29,167,950
Customer Concentration Risk
Concentration risks
Number of significant customers | customer	2	3	2	3
Sales, net	$ 16,400,000	$ 5,000,000	$ 21,700,000	$ 12,600,000
Concentration risk, revenue	60.60%	43.20%	43.60%	43.30%
Supplier Concentration Risk | China
Concentration risks
Concentration risk, geographic	80.5%	84.2%	82.2%	82.1%
Department of health and human services
Concentration risks
Sales, net	$ 12,900,000
Contract receivables	$ 83,800,000		$ 83,800,000

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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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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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