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Warrant Liabilities - Estimated fair value Private Warrants (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Warrant liabilities | $ 6,026 | $ 9,737
Private Placement Warrants [Member] |  |
Warrant liabilities | $ 6,026 | $ 9,737

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- Definition The fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879 + Details
Name: | us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsFairValueOfShares
Namespace Prefix: | us-gaap_
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: |