SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risks (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) customer	Mar. 31, 2023 USD ($) customer
Concentration risks
Aggregate dollar amount of net sales	$ 7,599,363	$ 11,001,102
Net Sales | Customer Concentration Risk
Concentration risks
Number of significant customers | customer	2	3
Net Sales | Customer Concentration Risk | Significant customers
Concentration risks
Aggregate dollar amount of net sales	$ 3,400,000	$ 7,000,000.0
Percentage of net sales to significant customers	44.30%	63.50%
Cost of Sales, Manufacturing | Supplier Concentration Risk | China
Concentration risks
Percentage of net sales to significant customers	90.40%	92.60%