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Income Taxes (Net Operating Loss Carryforwards and Tax Credits) (Narrative) (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Tax Credit Carryforward [Line Items] |
Operating loss carryforwards, carried forward indefinetly | $ 32,258
Federal [Member] |
Tax Credit Carryforward [Line Items] |
Operating loss carryforwards | 195,856
Tax credit carryforwards, research | 8,631
State [Member] |
Tax Credit Carryforward [Line Items] |
Operating loss carryforwards | 8,610
Tax credit carryforwards, research | 4,761
Foreign [Member] |
Tax Credit Carryforward [Line Items] |
Operating loss carryforwards | 34,309
Tax credit carryforwards, research | 26,869
General foreign tax credit | 163
Canada Revenue Agency [Member] | Foreign [Member] |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, research | $ 121,076

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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