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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2022 USD ($) customer	Mar. 31, 2022	Jun. 30, 2021 USD ($) customer	Mar. 31, 2021	Jun. 30, 2022 USD ($) customer	Jun. 30, 2021 USD ($) customer
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 14,336,569		$ 42,496,944		$ 59,078,919	$ 92,570,669
Customer Concentration Risk | Revenue | Significant customers
Concentration risks
Number of significant customers | customer	3		1		4	1
Aggregate dollar amount of net sales to significant customers	$ 8,300,000		$ 27,400,000		$ 44,400,000	$ 65,100,000
Percentage of net sales to significant customers	57.60%		64.40%		75.20%	70.40%
Supplier Concentration Risk | Revenue | China
Concentration risks
Concentration risk, geographic		83.5%		90.6%	91.2%	90.4%

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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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