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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 | Oct. 31, 2019 | Apr. 30, 2019 | Jun. 30, 2022 | Dec. 31, 2021
Related Party Transactions [Abstract] |  |  |  |  |
Consulting service fee for IPO |  |  | $ 1.0 |  |
Consulting service fee for follow on offering | $ 0.5 | $ 0.5 |  |  |
Adjustment to additional paid in capital due to consulting service fee |  |  |  | $ 2.0 | $ 2.0

X
- Definition The amount of adjustment to additional paid in capital for consulting service fee. + References No definition available. + Details
Name: | tw_AdjustmentToAdditionalPaidInCapitalDueToConsultingServiceFee
Namespace Prefix: | tw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of consulting service incurred for follow on offering. + References No definition available. + Details
Name: | tw_ConsultingServiceFeeForFollowOnOffering
Namespace Prefix: | tw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of consulting service incurred for IPO. + References No definition available. + Details
Name: | tw_ConsultingServiceFeeForIpo
Namespace Prefix: | tw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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