The discount rate from market value on specific date that participants pay for shares.

No definition available.

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- Definition

Represents the total fair value of nonvested equity stock units granted during the period.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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

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Equity Incentive Plans and Stock-Based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Stock compensation plan
Stock-based compensation
Shares available for issuance	12,014,121		11,954,150
Contingently issuable ESPP shares
Stock-based compensation
Shares available for issuance	2,400,000
Discount from the fair market value (as a percentage)	15.00%
Stock-based compensation expense	$ 0.6	$ 0.6
Unrecognized compensation cost	$ 0.2
Unrecognized compensation cost, weighted-average period	1 month
Nonvested equity stock units and stock units
Stock-based compensation
Stock-based compensation expense	$ 8.9	$ 12.5
Unrecognized compensation cost	$ 57.9
Unrecognized compensation cost, weighted-average period	2 years
Awards, nonvested grants in period, shares	54,262	1,100,000
Requisite service period	4 years	4 years
Awards, nonvested grants in period, fair value	$ 3.6	$ 52.7
Nonvested equity stock units and stock units \| Director
Stock-based compensation
Requisite service period	1 year	1 year
Nonvested equity stock units and stock units \| Minimum
Stock-based compensation
Awards, vesting rights (as a percentage)	0.00%	0.00%
Nonvested equity stock units and stock units \| Maximum
Stock-based compensation
Awards, vesting rights (as a percentage)	200.00%	200.00%