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No definition available.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

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).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

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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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Percentage of vesting of award under share-based payment arrangement.

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- Definition

Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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No definition available.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Value, after forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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Stock-based compensation - Narratives (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Jan. 01, 2024	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Issuance price (in usd per share)		$ 5.68	$ 5.68
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares)		20,266,875	20,266,875		17,104,505
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average exercise price (in usd per share)		$ 3.31	$ 3.31		$ 3.03
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Additional shares authorized for issuance (in shares)	4,654,384
Shares available for grant (in shares)		3,667,088	3,667,088
2023 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares available for employee (in shares)		2,500,000	2,500,000
Stock options \| 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value of shares granted (in usd per share)			$ 3.15	$ 1.46
Share based compensation expense not yet recognized, options		$ 29.6	$ 29.6
Share based compensation expense not yet recognized, recognition period (in years)			2 years 7 months 6 days
Stock options \| 2020 Plan \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage (as a percent)			25.00%
Stock options \| 2020 Plan \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage (as a percent)			25.00%
Stock options \| 2020 Plan \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage (as a percent)			25.00%
Stock options \| 2020 Plan \| Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award
Vesting percentage (as a percent)			25.00%
Unvested restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (in shares)		268,872	268,872		374,208
Unvested restricted stock \| 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Share based compensation expense not yet recognized, recognition period (in years)			10 months 24 days
Share based compensation expense not yet recognized other than options		$ 0.6	$ 0.6
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value of shares granted (in usd per share)			$ 3.62
Share based compensation expense not yet recognized, recognition period (in years)			2 years
Share based compensation expense not yet recognized other than options		$ 11.7	$ 11.7
Fair value of vested options			$ 0.0
Granted (in shares)			2,426,855
Shares outstanding (in shares)		4,548,955	4,548,955		2,198,334
Restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)			1 year
Restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (in years)			4 years
Restricted Stock Award with Market Conditions
Share-based Compensation Arrangement by Share-based Payment Award
Share based compensation expense not yet recognized, recognition period (in years)			1 year 3 months 18 days
Granted (in shares)		1,500,000
Grant-date fair value			$ 5.5
Volatility rate		97.00%
Risk-free interest rate		4.50%
SARs \| 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares outstanding (in shares)		394,736	394,736
Intrinsic value, shares outstanding		$ 2.2	$ 2.2
SARs \| 2020 And 2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares)		197,150	197,150
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average exercise price (in usd per share)		$ 4.65	$ 4.65
Deferred compensation expense		$ 0.1	$ 0.1