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Income Taxes (Narrative) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Domestic Tax Authority |
Tax Credit Carryforward [Line Items] |
Domestic operating loss carryforwards | $ 27.0
Domestic Tax Authority | Limitations On Use To Section 382 [Member] |
Tax Credit Carryforward [Line Items] |
Domestic operating loss carryforwards | 56.0
Foreign Tax Authority [Member] |
Tax Credit Carryforward [Line Items] |
Foreign operating loss carryforwards | 10.0
Foreign Tax Authority [Member] | Research Tax Credit Carryforward |
Tax Credit Carryforward [Line Items] |
Foreign research and development tax credit carryforwards | $ 2.7

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