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Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Retail spine inventory, net |  | $ 1,602 | $ 1,708
Property and equipment, net |  | 1,162 | 959
Intangible assets, net |  | 2,651 | 2,249
Total assets |  | 5,415 | 4,916
Debt - related party |  | 2,356 | $ 2,500
Product revenue | $ 6,222 | 11,227 |
Costs of revenue | 1,474 | 6,351 |
Gross profit | 4,748 | 4,876 |
Research and development | 1,524 | 1,571 |
General and administrative | 190 | 726 |
Sales and marketing | 3,358 | 6,147 |
Total operating expenses | 5,072 | 8,444 |
Loss from discontinued operations | $ (324) | $ (3,568) |

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