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v3.24.3

Retirement plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Retirement plans |  |  |  |
Minimum percentage of annual eligible compensation by the participants |  |  | 1.00% |
Maximum percentage of annual eligible compensation by the participants |  |  | 90.00% |
Percentage of contribution matched |  |  | 5.00% |
Employer match of employee contributions of first 3% of contributions |  |  | 100.00% |
Percentage of contribution, matched 100% by employer |  |  | 3.00% |
Employer match of employee contributions of next 3% of contributions |  |  | 50.00% |
Percentage of contribution, matched 50% by employer |  |  | 2.00% |
Contribution expenses | $ 0.2 | $ 0.3 | $ 0.9 | $ 0.9

X
- Definition Represents the employer matching contribution of the second level of employee contributions. + References No definition available. + Details
Name: | th_DefinedContributionPlanEmployerMatchPercentLevelTwo
Namespace Prefix: | th_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the first level of employee contributions which are matched by the employer. + References No definition available. + Details
Name: | th_DefinedContributionPlanEmployerMatchingContributionPercentLevelOne
Namespace Prefix: | th_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the second level of employee contributions which are matched by the employer + References No definition available. + Details
Name: | th_DefinedContributionPlanEmployerMatchingContributionPercentLevelTwo
Namespace Prefix: | th_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | th_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent
Namespace Prefix: | th_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Amount of cost for defined contribution plan. + 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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration