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EQUITY AND STOCK COMPENSATION PLANS - Stock-based employee compensation expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
EQUITY AND STOCK COMPENSATION PLANS    
Total stock-based compensation expense $ 692 $ 580
Cost of services    
EQUITY AND STOCK COMPENSATION PLANS    
Total stock-based compensation expense 18 25
Research and development    
EQUITY AND STOCK COMPENSATION PLANS    
Total stock-based compensation expense 117 101
Selling and marketing    
EQUITY AND STOCK COMPENSATION PLANS    
Total stock-based compensation expense 57 13
General and administrative    
EQUITY AND STOCK COMPENSATION PLANS    
Total stock-based compensation expense $ 500 $ 441