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Income Taxes, Tax Credit Carryforwards (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Federal [Member] |
Operating Loss Carryforwards [Abstract] |
Net operating loss carryforwards | $ 99.5
Federal [Member] | Research and Development [Member] |
Tax Credit Carryforwards [Abstract] |
Tax credit carryforwards | 198.8
California [Member] |
Operating Loss Carryforwards [Abstract] |
Net operating loss carryforwards | 117.9
California [Member] | Research and Development [Member] |
Tax Credit Carryforwards [Abstract] |
Tax credit carryforwards | $ 74.1

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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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