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STOCK-BASED COMPENSATION PLANS - stock-based compensation expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Allocated Share-based Compensation Expense | $ 579 | $ 158 | $ 1,076 | $ 298
Cost of Revenue |  |  |  |
Allocated Share-based Compensation Expense | 2 | 5 | 9 | 10
Sales and marketing expense |  |  |  |
Allocated Share-based Compensation Expense | 98 | 52 | 127 | 94
General, and administrative |  |  |  |
Allocated Share-based Compensation Expense | $ 479 | $ 101 | $ 940 | $ 194

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