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STOCK-BASED COMPENSATION PLANS - Summary of stock-based compensation expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
STOCK-BASED COMPENSATION PLANS |  |  |  |
Total stock based compensation expense | $ 317 | $ 770 | $ 1,453 | $ 2,345
Costs of revenue - devices and supplies |  |  |  |
STOCK-BASED COMPENSATION PLANS |  |  |  |
Total stock based compensation expense | 8 | 10 | 29 | 27
Sales and marketing expense |  |  |  |
STOCK-BASED COMPENSATION PLANS |  |  |  |
Total stock based compensation expense | (31) | 125 | 125 | 492
General and administrative |  |  |  |
STOCK-BASED COMPENSATION PLANS |  |  |  |
Total stock based compensation expense | $ 340 | $ 635 | $ 1,299 | $ 1,826

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