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v3.23.1

Retirement Plans (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
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% |
Percentage of contribution, matched 100% by employer | 3.00% |
Employer match of employee contributions of first 3% of contributions | 100.00% |
Percentage of contribution, matched 50% by employer | 2.00% |
Employer match of employee contributions of next 3% of contributions | 50.00% |
Contribution expenses | $ 0.4 | $ 0.2

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

X
- 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

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
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
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration