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

Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Narrative) (Details)

Related Party Transactions (Narrative) (Details) - USD ($)			1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 11, 2022	May 11, 2022	Sep. 30, 2023	Aug. 31, 2020	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Common Stock, par value			$ 0.001		$ 0.001		$ 0.001		$ 0.001
Aggregate purchase price							$ 13,155,000
Proceeds from issuance of Common stock							2,056,000	$ 5,750,000
Total notes payable			$ 45,791,000		$ 45,791,000		45,791,000		$ 91,730,000
Repayments of Debt							50,375,000	0
Interest expense, interest					$ 1,877,000	$ 2,839,000	$ 10,400,000	7,397,000
Preferred Stock, shares outstanding			3,427,138		3,427,138		3,427,138		3,427,138
Preferred Stock, Liquidation Preference Per Share			$ 25.00		$ 25.00		$ 25.00		$ 25.00
Avenue
Related Party Transaction [Line Items]
Shares issued	3,636,365
Proceeds from issuance of Common stock	$ 10,300,000
Paid in Kind dividend as a percentage of fully diluted outstanding capitalization							2.50%
Avenue \| Private Placement
Related Party Transaction [Line Items]
Shares issued			767,085
Common Stock, par value			$ 0.0001		0.0001		$ 0.0001
Aggregate purchase price			$ 550,000
Share price per share			$ 0.717		$ 0.717		$ 0.717
Proceeds from issuance of Common stock			$ 550,000
Journey
Related Party Transaction [Line Items]
Proceeds from Related Party Agreement					$ 11,000	7,000	$ 47,000	100,000
Chief Executive Officer (Dr. Rosenwald) [Member]
Related Party Transaction [Line Items]
Interest own in percent by principal stockholder or director			11.50%		11.50%		11.50%
Executive Vice Chairman [Member]
Related Party Transaction [Line Items]
Interest own in percent by principal stockholder or director			11.00%		11.00%		11.00%
Related Party [Member]
Related Party Transaction [Line Items]
Revenue - related party					$ 31,000	48,000	$ 97,000	118,000
Related Party [Member] \| Journey
Related Party Transaction [Line Items]
Other receivables - related party			$ 11,000		11,000		11,000
Stock Contribution Agreement [Member] \| Avenue
Related Party Transaction [Line Items]
Proceeds from issuance of Common stock	$ 10,400,000
Percentage of common and preferred shares to be transferred to partner company.		100.00%
Minimum proceeds required for closing of equity financing		$ 7,500,000
Percentage of partner company shares to be repurchased by partner company in stock contribution agreement		100.00%
TGTX [Member] \| Shared Services Agreement [Member] \| Related Party [Member]
Related Party Transaction [Line Items]
Revenue - related party					100,000	100,000	300,000	700,000
Other receivables - related party			100,000		100,000		100,000
TGTX [Member] \| Desk Share Agreements [Member] \| New York, NY Office Space [Member]
Related Party Transaction [Line Items]
Total payment for rent					600,000	900,000	1,500,000	1,400,000
TGTX [Member] \| Desk Share Agreements [Member] \| Related Party [Member]
Related Party Transaction [Line Items]
Other receivables - related party			$ 0		0		0
TGTX [Member] \| Desk Share Agreements [Member] \| Related Party [Member] \| New York, NY Office Space [Member]
Related Party Transaction [Line Items]
Revenue - related party					$ 500,000	$ 500,000	$ 1,400,000	$ 1,400,000
Cyprium [Member] \| Related Party [Member] \| 9.375% Series A Cumulative Redeemable Perpetual Preferred Stock
Related Party Transaction [Line Items]
Preferred Stock, dividend rate percentage				9.375%
Annual cash dividend payable				$ 2.34375
Preferred Stock, shares outstanding			316,600		316,600		316,600
Monthly cash dividend				0.19531
Preferred Stock, Liquidation Preference Per Share				$ 25.00
Exchange term of preferred stock				24 months