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STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
STOCK-BASED COMPENSATION        
Total stock-based compensation expense $ 410 $ 367 $ 1,031 $ 767
Remaining unrecognized compensation expense related to nonvested awards 800   $ 800  
Weighted-average remaining requisite service period     9 months 18 days  
Cost of sales        
STOCK-BASED COMPENSATION        
Total stock-based compensation expense 1 5 $ 7 9
Selling, general and administrative        
STOCK-BASED COMPENSATION        
Total stock-based compensation expense 345 298 853 628
Research and development        
STOCK-BASED COMPENSATION        
Total stock-based compensation expense $ 64 $ 64 $ 171 $ 130