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Related Party Transactions - Narrative (Details) $ in Millions | 1 Months Ended
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Apr. 30, 2020 USD ($)
Related Party Transactions |
Consulting service fee for follow on offering | $ 0.5

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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration