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Long-Term Debt - Aggregate Future Principal, Final Payment Fees and Discounts of Long-Term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | [1]
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Debt Disclosure [Abstract] |  |
Three months ending December 31, 2019 | $ 1,146 |
Year ending December 31, 2020 | 6,086 |
Year ending December 31, 2021 | 8,576 |
Year ending December 31, 2022 | 21,950 |
Total payments | 37,758 |
Less: interest, final payment fees, discount and issuance cost | (5,079) |
Total payments, net of interest, final payment fees, discount and issuance cost | 32,679 |
Less: current portion of long-term debt | (3,981) | $ (789)
Long-term debt | $ 28,698 | $ 21,690
[1] | The consolidated balance sheet as of December 31, 2018 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

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