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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Adoption of new accounting pronouncements |  |  |
Receivables, inclusive of trade and unbilled | $ 57,537 |  | $ 62,405
Retained earnings | $ 173,731 |  | 179,440
Adjustment |  |  |
Adoption of new accounting pronouncements |  |  |
Retained earnings |  |  | $ (1,727)
ASU 2016-16 | Adjustment |  |  |
Adoption of new accounting pronouncements |  |  |
Receivables, inclusive of trade and unbilled |  | $ (300) |
Retained earnings |  | $ (300) |

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