Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2018
Federal \| Net Operating Losses
Income Taxes
Net operating loss carryforwards	$ 396.5	$ 186.9
Indefinite net operating loss carryforward	209.6
Federal \| Research and Development.
Income Taxes
Tax credit carryforwards	6.3
State \| Net Operating Losses
Income Taxes
Net operating loss carryforwards	77.4
State \| Research and Development.
Income Taxes
Tax credit carryforwards	$ 0.9

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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