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Other Non-Current Assets - Other non-current assets (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Other Non-Current Assets |  |
Cloud computing implementation costs | $ 7,198 | $ 7,198
Less: accumulated amortization | (5,033) | (3,844)
Other non-current assets | $ 2,165 | $ 3,354

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- Definition Other Assets Noncurrent, Accumulated Amortization + References No definition available. + Details
Name: | th_OtherAssetsNoncurrentAccumulatedAmortization
Namespace Prefix: | th_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other Assets Noncurrent, Gross + References No definition available. + Details
Name: | th_OtherAssetsNoncurrentGross
Namespace Prefix: | th_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherAssetsMiscellaneousNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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