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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |
Interest income | $ 234,000 |  |  |
Swap |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |
Derivative, notional amount | 50,000,000 |  | $ 50,000,000 |
Investment expense | $ 178,000 |  | $ 468,000 |
Interest income |  | $ 21,000 |  | $ 142,000

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