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Income Taxes - Tax Credit Carryforwards (Details) $ in Millions	Dec. 31, 2019 USD ($)
Federal
Tax credit carryforwards
Net operating loss carryforward expected to be unutilized amount	$ 10.6
Federal | Research and development credit carryforward
Tax credit carryforwards
Tax credit carryforwards	28.9
Tax credit carryforwards expected to be unutilized amount	0.3
State | Research and development credit carryforward
Tax credit carryforwards
Tax credit carryforwards	12.8
Tax credit subject to expiration beginning in 2023	2.9
Tax credit not subject to expiration	$ 9.8

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates that are anticipated to be unutilized.

+ References

No definition available.

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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 with expiration date.

+ References

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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 with expiration date that is anticipated to go unutilized.

+ References

No definition available.

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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 with no expiration date.

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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

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