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Equity Incentive Plans and Stock-Based Compensation (Details Textual) - USD ($) $ in Millions		3 Months Ended
	Apr. 27, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Stock compensation plan
Stock-based compensation
Shares available for issuance		5,956,496		7,655,769
Stock compensation plan | 2015 Equity Incentive Plan | Subsequent event
Stock-based compensation
Number of additional shares authorized	5,210,000
Contingently issuable ESPP shares
Stock-based compensation
Shares available for issuance		2,600,000
Discount from the fair market value (as a percentage)		15.00%
Stock-based compensation expense		$ 0.6	$ 0.5
Unrecognized compensation cost		$ 0.2
Unrecognized compensation cost, weighted-average period		1 month
Options
Stock-based compensation
Unrecognized compensation cost		$ 0.1
Unrecognized compensation cost, weighted-average period		6 months
Nonvested equity stock units and stock units
Stock-based compensation
Stock-based compensation expense		$ 12.5	$ 7.3
Unrecognized compensation cost		$ 98.5
Unrecognized compensation cost, weighted-average period		2 years 7 months 6 days
Awards, nonvested grants in period, shares		1,123,519	1,600,000
Requisite service period		4 years	4 years
Awards, nonvested grants in period, fair value		$ 52.7	$ 44.6
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%

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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