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STOCK-BASED COMPENSATION PLANS - stock-based compensation expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Allocated Share-based Compensation Expense $ 730 $ 258 $ 1,806 $ 556
Cost of Revenue        
Allocated Share-based Compensation Expense 13 5 22 15
Sales and marketing expense        
Allocated Share-based Compensation Expense 13 2 45 6
General, and administrative        
Allocated Share-based Compensation Expense $ 704 $ 251 $ 1,739 $ 535