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STOCK-BASED COMPENSATION PLANS - stock-based compensation expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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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

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