SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) customer	Dec. 31, 2022 USD ($) customer	Dec. 31, 2021 USD ($) customer
Concentration risks
Aggregate dollar amount of net sales to significant customers	$ 43,596,926	$ 94,818,938	$ 188,382,454
Net Sales | Customer Concentration Risk
Concentration risks
Number of significant customers | customer	4	4	1
Aggregate dollar amount of net sales to significant customers	$ 25,900,000	$ 66,400,000	$ 113,700,000
Net Sales | Customer Concentration Risk | Significant customers
Concentration risks
Percentage of net sales to significant customers	61.30%	70.00%	60.30%
Cost of Sales, Manufacturing | Supplier Concentration Risk | China
Concentration risks
Percentage of net sales to significant customers	88.40%	91.60%	92.00%