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STOCK-BASED COMPENSATION PLANS - stock-based compensation expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total stock based compensation expense $ 108 $ 497
Cost of Revenue    
Total stock based compensation expense 15 6
Sales and marketing expense    
Total stock based compensation expense 15 29
General and administrative    
Total stock based compensation expense $ 78 $ 462