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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Share-based compensation and stockholders' equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Sep. 17, 2024	Sep. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Dec. 31, 2023	May 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested options forfeited (in shares)				1,000,000
Warrant liability		$ 13.9		$ 13.9	$ 0.0
Level 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant liability		$ 13.9		$ 13.9	$ 0.0
Series I Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)		1,000,000		1,000,000
Series II Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)		1,500,000		1,500,000
Subscription Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	1,100,000
Consideration received on transaction	$ 10.0
Sale of stock, price per share (in dollars per share)	$ 8.98
Liabilities, fair value adjustment		$ 1.6		$ 1.6
At-The-Market Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		0	1,100,000
Sale of stock, price per share (in dollars per share)			$ 8.22
Sale of stock, aggregate offering amount, maximum						$ 150.0
Sale of stock, consideration received on transaction, gross			$ 9.1
Sale of stock, amount remaining available for sale of shares		$ 140.9		$ 140.9
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)				4,100,000
Stock Options \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Stock Options \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Stock Options \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Performance Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)				800,000
Award vesting period				5 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity instruments other than options granted (in shares)				200,000
Equity instruments other than options, forfeited in period (in shares)				400,000
Restricted Stock Units \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Restricted Stock Units \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Restricted Stock Units \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Long-Term Incentive Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted long-term incentive award				$ 8.0
Award vesting period				5 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
Equity instruments other than options, forfeited in period (in shares)				100,000
Performance Shares \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Performance Shares \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%
Performance Shares \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage				33.33%