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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax expense | $ 23 | $ 19 | $ 66 | $ 64 |
Federal |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  |  |  | $ 296,100
Tax credit carryforwards |  |  |  |  | 8,600
State |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  |  |  | 88,000
Tax credit carryforwards |  |  |  |  | $ 1,500

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