Fortress Biotech, Inc. Quarterly report pursuant to Section 13 or 15(d)

Name:	fbio_AssetPurchaseAgreementAbstract
Namespace Prefix:	fbio_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of due upon the achievement of certain net sales targets.

No definition available.

Name:	fbio_AssetPurchaseAgreementAdditionalMilestonePaymentsDue
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount repewsents that asset purchase agreement amount due.

No definition available.

Name:	fbio_AssetPurchaseAgreementAmountDue
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount represents the asset purchase agreement amount due on first anniversary of execution.

No definition available.

Name:	fbio_AssetPurchaseAgreementAmountDueOnFirstAnniversaryOfExecution
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The remaining amount of the total consideration that is to be paid on second anniversary of the execution of the Asset Purchase Agreement, to acquire the intangible asset.

No definition available.

Name:	fbio_AssetPurchaseAgreementAmountDueOnSecondAnniversaryOfExecution
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The remaining amount of the total consideration that is to be paid on third anniversary of the execution of the Asset Purchase Agreement, to acquire the intangible asset.

No definition available.

Name:	fbio_AssetPurchaseAgreementAmountDueOnThirdAnniversaryOfExecution
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of initial discount on the imputed interest recorded by the company, pursuant to the terms of the Asset Purchase Agreement.

No definition available.

Name:	fbio_AssetPurchaseAgreementInitialDiscountForImputedInterest
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of total consideration to be paid to acquire intangible assets under an Asset Purchase Agreement.

No definition available.

Name:	fbio_AssetPurchaseAgreementTotalConsideration
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount of upfront payment to be paid to acquire intangible assets under an Asset Purchase Agreement.

No definition available.

Name:	fbio_AssetPurchaseAgreementUpfrontPaymentToBeMade
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the information pertaining to expected life term.

No definition available.

Name:	fbio_ExpectedLifeTerm
Namespace Prefix:	fbio_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The remaining amount payable for acquisition of intangible asset.

No definition available.

Name:	fbio_IntangibleAssetAcquisitionRemainingAmountPayable
Namespace Prefix:	fbio_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents that number of additional milestones.

No definition available.

Name:	fbio_NumberOfAdditionalMilestones
Namespace Prefix:	fbio_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of marketing milestones.

No definition available.

Name:	fbio_NumberOfMarketingMilestones
Namespace Prefix:	fbio_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents that term of anniversary.

No definition available.

Name:	fbio_TermOfAnniversary
Namespace Prefix:	fbio_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

Name:	us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=fbio_LicenseAndSupplyAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_StatementScenarioAxis=fbio_FirstAnniversaryOfExecutionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_StatementScenarioAxis=fbio_SecondAnniversaryOfExecutionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_StatementScenarioAxis=fbio_ThirdAnniversaryOfExecutionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=fbio_JourneyMedicalCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_FiniteLivedIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: