SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) customer	Sep. 30, 2021 USD ($) customer	Sep. 30, 2022 USD ($) customer	Sep. 30, 2021 USD ($) customer
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 23,061,285	$ 36,356,047	$ 82,140,204	$ 128,926,716
Net Sales | Customer Concentration Risk
Concentration risks
Number of significant customers | customer	2	2	4	1
Aggregate dollar amount of net sales to significant customers	$ 15,500,000	$ 22,600,000	$ 60,000,000.0	$ 83,600,000
Net Sales | Customer Concentration Risk | Significant customers
Concentration risks
Percentage of concentration risk to significant customers	67.40%	62.10%	73.00%	64.80%
Cost of Sales, Manufacturing | Supplier Concentration Risk | China
Concentration risks
Percentage of concentration risk to significant customers	93.90%	91.90%	92.00%	90.90%