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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Devices - for resale | $ 18,280 | $ 11,319
Work in process | 1,334 |
Raw materials | 7,538 | 8,826
Accessories | 1,911 | 1,686
Total inventory | $ 29,063 | $ 21,831

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