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Subsequent Event - Additional Information (Detail) - Subsequent Event $ in Millions	Apr. 28, 2020 USD ($)
Subsequent Event [Line Items]
Percentage of common stock held	24.00%
Adicet
Subsequent Event [Line Items]
Contract termination fee	$ 6.1

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- Definition

Common Stock Ownership Percentage

+ References

No definition available.

+ Details

Name:	torc_CommonStockOwnershipPercentage
Namespace Prefix:	torc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Termination Fees

+ References

No definition available.

+ Details

Name:	torc_TerminationFees
Namespace Prefix:	torc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	srt_ConsolidatedEntitiesAxis=torc_AdicetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: