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STOCK-BASED COMPENSATION PLANS - stock-based compensation expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Total stock based compensation expense | $ 401 | $ 579 | $ 509 | $ 1,076
Cost of Revenue |  |  |  |
Total stock based compensation expense | 15 | 2 | 30 | 9
Sales and marketing expense |  |  |  |
Total stock based compensation expense | 15 | 98 | 30 | 127
General and administrative |  |  |  |
Total stock based compensation expense | $ 371 | $ 479 | $ 449 | $ 940

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