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STOCK-BASED COMPENSATION PLANS - Summary of stock-based compensation expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Total stock based compensation expense $ 589 $ 108
Cost of sales    
Total stock based compensation expense 15 15
Sales and marketing expense.    
Total stock based compensation expense 59 15
General and administrative    
Total stock based compensation expense $ 515 $ 78