No definition available.

Name:	fbrx_AccruedCompensation
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Accrued issuance costs.

No definition available.

Name:	fbrx_AccruedIssuanceCosts
Namespace Prefix:	fbrx_
Data Type:	xbrli:monetaryItemType
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Accrued manufacturing and research expenses.

No definition available.

Name:	fbrx_AccruedManufacturingAndResearchExpenses
Namespace Prefix:	fbrx_
Data Type:	xbrli:monetaryItemType
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Deferred research and development credit current.

No definition available.

Name:	fbrx_DeferredResearchAndDevelopmentCreditCurrent
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Data Type:	xbrli:monetaryItemType
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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccruedProfessionalFeesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- References

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

Forte Biosciences, Inc. 10-K