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STOCK-BASED COMPENSATION PLANS - Summary of stock-based compensation expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Total stock based compensation expense $ 535 $ 401 $ 1,124 $ 509
Cost of sales        
Total stock based compensation expense 12 15 27 30
Sales and marketing expense.        
Total stock based compensation expense 55 15 114 30
General and administrative        
Total stock based compensation expense $ 468 $ 371 $ 983 $ 449