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Commitments and Contingencies - Future Lease Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Future Minimum Payments Due |  |
2019 | $ 0 |
2020 | 47 |
2021 | 47 |
2022 | 30 |
2023 | 30 |
Thereafter | 31 |
Total undiscounted lease payments | 185 |
Less: imputed interest | (13) |
Present value of lease payments | $ 172 |
Future Minimum Payments Due (Under Topic 840) |  |
2019 |  | $ 47
2020 |  | 47
2021 |  | 47
2022 |  | 30
2023 |  | 30
Thereafter |  | 31
Total undiscounted lease payments |  | 232
Present value of lease payments |  | $ 232

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