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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax expense | $ 23 | $ 26 | $ 49 | $ 43 |
Federal |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  |  |  | $ 324,800
Tax credit carryforwards |  |  |  |  | 8,900
State |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  |  |  | 6,500
Tax credit carryforwards |  |  |  |  | $ 1,600

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