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Warrant Liabilities - Estimated fair value Private Warrants (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Warranty Liability Non Current | $ 21,974 | $ 1,600
Private Placement Warrants [Member] |  |
Warranty Liability Non Current | $ 21,974 | $ 1,600

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- Definition Warranty Liability Non Current + References No definition available. + Details
Name: | th_WarrantyLiabilityNonCurrent
Namespace Prefix: | th_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=th_PrivatePlacementWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |