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SIGNIFICANT ACCOUNTING POLICIES - Breakdown of net revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Device revenue |  |  |  |  |  |  |  |  |  |
Total Device revenue | $ 14,162 | $ 11,817 | $ 10,297 | $ 9,196 | $ 9,337 | $ 8,131 | $ 7,573 | $ 6,876 | $ 45,472 | $ 31,917
Devices [Member] |  |  |  |  |  |  |  |  |  |
Device revenue |  |  |  |  |  |  |  |  |  |
Purchased |  |  |  |  |  |  |  |  | 4,035 | 1,950
Leased |  |  |  |  |  |  |  |  | 6,678 | 4,872
Total Device revenue |  |  |  |  |  |  |  |  | $ 10,713 | $ 6,822

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