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Summary of Significant Accounting Policies - Cumulative Effect of Changes from Adoption of ASU (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Assets |  |  |  |
Right of use assets | $ 483 | $ 604 | $ 451 | $ 0
Liabilities |  |  |  |
Current operating leases | 198 | 189 | 126 | 0
Long-term operating leases | 285 | 415 | 325 | 0
Total lease liabilities | $ 483 | $ 604 | 451 | $ 0
Accounting Standards Update 2016-02 |  |  |  |
Assets |  |  |  |
Right of use assets |  |  | 451 |
Liabilities |  |  |  |
Current operating leases |  |  | 126 |
Long-term operating leases |  |  | 325 |
Total lease liabilities |  |  | $ 451 |

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