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Commitments and Contingencies - Maturities of Lease Liabilities and Minimum Lease Payments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Leases |  |
2019 | $ 887 |
2020 | 1,809 |
2021 | 1,587 |
2022 | 1,460 |
2023 | 1,369 |
2024 | 1,175 |
Thereafter | 9,938 |
Total lease payments | 18,225 |
Less imputed interest | (4,019) |
Total | 14,206 |
Finance Leases |  |
2019 | 490 |
2020 | 986 |
2021 | 987 |
2022 | 987 |
2023 | 1,506 |
2024 | 940 |
Thereafter | 1,645 |
Total lease payments | 7,541 |
Less imputed interest | (1,331) |
Total | $ 6,210 |
Previous Lease Accounting Standard, Minimum Lease Payments |  |
2019 |  | $ 1,771
2020 |  | 1,709
2021 |  | 1,485
2022 |  | 1,355
2023 |  | 1,261
Thereafter |  | 10,538
Total |  | $ 18,119

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