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Commitments and Contingencies - Future Lease Payments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Commitments and Contingencies Disclosure [Abstract] |  |
2019 | $ 0 | $ 47
2020 | 47 | 47
2021 | 47 | 47
2022 | 30 | 30
2023 | 30 | 30
Thereafter | 31 | 31
Total undiscounted lease payments | 185 | 232
Less: imputed interest | (16) | 0
Present value of lease payments | $ 169 | $ 232

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