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Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Leases |  |
Remaining 2019 | $ 125 |
2020 | 587 |
2021 | 471 |
2022 | 443 |
2023 | 455 |
Thereafter | 470 |
Total expected minimum lease obligation | 2,551 |
Less: Amount representing interest | (261) |
Operating lease liabilities | 2,290 |
Finance Leases |  |
Remaining 2019 | 150 |
2020 | 493 |
2021 | 480 |
2022 | 279 |
2023 | 21 |
Thereafter | 0 |
Total expected minimum lease obligation | 1,423 |
Less: Amount representing interest | (113) |
Present value of net minimum lease payments | $ 1,310 |
Operating Leases |  |
2019 |  | $ 717
2020 |  | 611
2021 |  | 494
2022 |  | 466
2023 |  | 479
Thereafter |  | 1,041
Total expected minimum lease obligation |  | 3,808
Capital Leases |  |
2019 |  | 532
2020 |  | 532
2021 |  | 519
2022 |  | 317
2023 |  | 40
Thereafter |  | 0
Total expected minimum lease obligation |  | 1,940
Less: Amount representing interest |  | (151)
Present value of net minimum lease payments |  | $ 1,789

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