Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2018
Federal \| Net Operating Losses
Income Taxes
Net operating loss carryforwards	$ 390.6	$ 188.9
Indefinite net operating loss carryforward	201.7
Federal \| Research and Development.
Income Taxes
Tax credit carryforwards	6.4
State \| Net Operating Losses
Income Taxes
Net operating loss carryforwards	79.9
State \| Research and Development.
Income Taxes
Tax credit carryforwards	$ 0.9

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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=121826272&loc=d3e32559-109319

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