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Debt - Summary of Future Minimum Payments (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Less: unamortized discount | $ (33) |
Less: current portion, net of unamortized discount | (1,729) |
Note payable, net of current portion and unamortized debt discount | 12,668 | $ 14,008
Note Payable [Member] |  |
Remainder of 2018 | 751 |
2019 | 4,762 |
2020 | 4,402 |
2021 | 4,033 |
2022 | 7,410 |
Total minimum payments | 21,358 |
Less: amount representing interest | (5,358) |
Notes payable, gross | 16,000 |
Less: unamortized discount | (1,603) |
Less: current portion, net of unamortized discount | (1,729) |
Note payable, net of current portion and unamortized debt discount | $ 12,668 |

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