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SIGNIFICANT ACCOUNTING POLICIES - Stock-based compensation expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
SIGNIFICANT ACCOUNTING POLICIES        
Stock-based compensation expense $ 1,505,000 $ 975,000 $ 2,412,000 $ 1,858,000
Options        
SIGNIFICANT ACCOUNTING POLICIES        
Stock-based compensation expense   1,000   5,000
RSUs        
SIGNIFICANT ACCOUNTING POLICIES        
Stock-based compensation expense 1,380,000 853,000 2,237,000 1,666,000
Outstanding unamortized share-based compensation expense 5,224,000   5,224,000  
Unrestricted Shares of Common Stock        
SIGNIFICANT ACCOUNTING POLICIES        
Stock-based compensation expense 105,000 112,000 155,000 178,000
Employee stock purchase plan        
SIGNIFICANT ACCOUNTING POLICIES        
Stock-based compensation expense $ 20,000 $ 9,000 $ 20,000 $ 9,000