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STOCK-BASED COMPENSATION PLANS - stock-based compensation expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Total stock based compensation expense | $ 2,681 | $ 820
Cost of Revenue |  |
Total stock based compensation expense | 37 | 21
Sales and marketing expense |  |
Total stock based compensation expense | 424 | 205
General and administrative |  |
Total stock based compensation expense | $ 2,220 | $ 594

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