Income Taxes - Operating loss carryforwards (Details) $ in Millions	Dec. 31, 2022 USD ($)
Federal
Net operating loss carryforwards
NOL carryforwards	$ 219.7
NOL carryforwards not subject to expiration	155.3
State
Net operating loss carryforwards
NOL carryforwards	$ 274.9

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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 https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant