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Related Party Transactions - Narrative (Details) $ in Millions	1 Months Ended
	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