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Employee Defined Contribution Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Mainland China Government Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 25.8 | $ 23.6 | $ 17.6
401(k) Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 1.0 | $ 0.5 | $ 0.0
Employer matching contribution percentage | 100.00% | 50.00% | 50.00%
Percentage of employee contribution that the employer matches | 5.00% | 5.00% | 5.00%
Mandatory Provident Fund |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Defined contribution plan expense | $ 0.2 | $ 0.2 | $ 0.0
Maximum | 401(k) Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of employees eligible compensation the employer matches | 5.00% | 5.00% | 5.00%

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480794/715-70-50-1 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent Of Employee Contribution + References No definition available. + Details
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- Details
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