Quarterly report [Sections 13 or 15(d)]

Segment Information (Schedule of Segment Information) (Details)

v3.26.3
Segment Information (Schedule of Segment Information) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Revenue          
Product revenue, net $ 18,925,000 $ 17,025,000 $ 52,685,000 $ 45,173,000  
Other revenue 234,000 606,000 1,229,000 2,010,000  
Net revenue 19,159,000 17,631,000 53,914,000 47,183,000  
Operating expenses          
Cost of goods - (excluding amortization of acquired intangible assets) 5,884,000 5,755,000 18,245,000 15,484,000  
Intangible assets amortization 969,000 1,064,000 3,064,000 3,193,000  
Research and development 1,678,000 208,000 3,023,000 12,268,000  
Selling, general and administrative 17,821,000 17,415,000 54,519,000 81,670,000  
Total operating expenses 26,352,000 24,442,000 78,851,000 112,615,000  
Loss from operations (7,193,000) (6,811,000) (24,937,000) (65,432,000)  
Other income (expense)          
Interest income 1,295,000 736,000 3,446,000 1,848,000  
Interest expense and financing fee (2,498,000) (2,742,000) (7,342,000) (8,065,000)  
Gain from deconsolidation of subsidiary 104,000   186,000 27,127,000  
Gain on sale of priority review voucher, net of expenses     158,873,000    
Change in fair value of partner company derivative liability     (7,085,000)    
Loss on common stock warrant liabilities   (2,000) 1,000 (399,000)  
Other income (expense) (18,000) 17,672,000 11,764,000 17,599,000  
Total other income (expense) (1,117,000) 15,664,000 159,843,000 38,110,000  
Income (loss) before income tax expense (8,310,000) 8,853,000 134,906,000 (27,322,000)  
Income tax (benefit) expense (56,000) 26,000 5,395,000 196,000  
Net income (loss) (8,254,000) 8,827,000 129,511,000 (27,518,000)  
Attributable to non-controlling interests 2,409,000 (2,977,000) (25,451,000) 38,270,000  
Net income (loss) attributable to Fortress (5,845,000) 5,850,000 104,060,000 10,752,000  
Other Significant Items          
Change in fair value of investment     11,791,000 15,075,000  
Equity method investment held by Urica 11,791,000 15,075,000 11,791,000 15,075,000  
Segment assets 280,215,000 181,407,000 280,215,000 181,407,000 $ 185,548,000
Stock-based compensation - Research & development 31,000 152,000 89,000 6,245,000  
Stock-based compensation - Selling, general and administrative 2,118,000 3,045,000 $ 6,693,000 20,035,000  
Number of reportable segments disclosed by definition flag     true    
Journey          
Revenue          
Product revenue, net 18,925,000 17,025,000 $ 52,685,000 45,173,000  
Other revenue 42,000 606,000 753,000 606,000  
Net revenue 18,967,000 17,631,000 53,438,000 45,779,000  
Operating expenses          
Cost of goods - (excluding amortization of acquired intangible assets) 5,884,000 5,755,000 18,245,000 15,484,000  
Intangible assets amortization 969,000 1,064,000 3,064,000 3,193,000  
Research and development 51,000 287,000 105,000 326,000  
Selling, general and administrative 12,593,000 12,054,000 33,590,000 34,505,000  
Total operating expenses 19,497,000 19,160,000 55,004,000 53,508,000  
Loss from operations (530,000) (1,529,000) (1,566,000) (7,729,000)  
Other income (expense)          
Interest income 140,000 154,000 451,000 441,000  
Interest expense and financing fee (919,000) (937,000) (2,717,000) (2,765,000)  
Other income (expense) (6,000) (3,000) (10,000) (71,000)  
Total other income (expense) (785,000) (786,000) (2,276,000) (2,395,000)  
Income (loss) before income tax expense (1,315,000) (2,315,000) (3,842,000) (10,124,000)  
Income tax (benefit) expense     15,000 60,000  
Net income (loss) (1,315,000) (2,315,000) (3,857,000) (10,184,000)  
Other Significant Items          
Segment assets 103,846,000 85,191,000 103,846,000 85,191,000  
Stock-based compensation - Selling, general and administrative 1,333,000 1,854,000 3,759,000 4,513,000  
Avenue          
Revenue          
Other revenue       1,404,000  
Net revenue       1,404,000  
Operating expenses          
Research and development 212,000 177,000 659,000 780,000  
Selling, general and administrative 492,000 547,000 1,466,000 2,955,000  
Total operating expenses 704,000 724,000 2,125,000 3,735,000  
Loss from operations (704,000) (724,000) (2,125,000) (2,331,000)  
Other income (expense)          
Interest income 13,000 34,000 48,000 96,000  
Loss on common stock warrant liabilities   (2,000) 1,000 14,000  
Total other income (expense) 13,000 32,000 49,000 110,000  
Income (loss) before income tax expense (691,000) (692,000) (2,076,000) (2,221,000)  
Net income (loss) (691,000) (692,000) (2,076,000) (2,221,000)  
Other Significant Items          
Segment assets 1,530,000 3,725,000 1,530,000 3,725,000  
Stock-based compensation - Research & development 9,000 31,000 38,000 102,000  
Stock-based compensation - Selling, general and administrative 38,000 132,000 131,000 421,000  
Checkpoint          
Operating expenses          
Research and development       10,775,000  
Selling, general and administrative       27,263,000  
Total operating expenses       38,038,000  
Loss from operations       (38,038,000)  
Other income (expense)          
Interest income       90,000  
Loss on common stock warrant liabilities       (108,000)  
Other income (expense)       (3,000)  
Total other income (expense)       (21,000)  
Income (loss) before income tax expense       (38,059,000)  
Net income (loss)       (38,059,000)  
Other Significant Items          
Stock-based compensation - Research & development       4,782,000  
Stock-based compensation - Selling, general and administrative       9,315,000  
Mustang          
Operating expenses          
Research and development 208,000 (333,000) 610,000 (1,199,000)  
Selling, general and administrative 850,000 957,000 2,676,000 2,961,000  
Total operating expenses 1,058,000 624,000 3,286,000 1,762,000  
Loss from operations (1,058,000) (624,000) (3,286,000) (1,762,000)  
Other income (expense)          
Interest income 94,000 156,000 295,000 379,000  
Total other income (expense) 94,000 156,000 295,000 379,000  
Income (loss) before income tax expense (964,000) (468,000) (2,991,000) (1,383,000)  
Net income (loss) (964,000) (468,000) (2,991,000) (1,383,000)  
Other Significant Items          
Segment assets 14,683,000 19,361,000 14,683,000 19,361,000  
Stock-based compensation - Research & development   1,000   (10,000)  
Stock-based compensation - Selling, general and administrative 2,000 22,000 45,000 116,000  
Fortress          
Revenue          
Other revenue 192,000   476,000    
Net revenue 192,000   476,000    
Operating expenses          
Research and development 1,207,000 77,000 1,649,000 1,586,000  
Selling, general and administrative 3,886,000 3,857,000 16,787,000 13,986,000  
Total operating expenses 5,093,000 3,934,000 18,436,000 15,572,000  
Loss from operations (4,901,000) (3,934,000) (17,960,000) (15,572,000)  
Other income (expense)          
Interest income 1,048,000 392,000 2,652,000 842,000  
Interest expense and financing fee (1,579,000) (1,805,000) (4,625,000) (5,300,000)  
Gain from deconsolidation of subsidiary 104,000   186,000 27,127,000  
Gain on sale of priority review voucher, net of expenses     158,873,000    
Change in fair value of partner company derivative liability     (7,085,000)    
Loss on common stock warrant liabilities       (305,000)  
Other income (expense) (12,000) 17,675,000 11,774,000 17,673,000  
Total other income (expense) (439,000) 16,262,000 161,775,000 40,037,000  
Income (loss) before income tax expense (5,340,000) 12,328,000 143,815,000 24,465,000  
Income tax (benefit) expense (56,000) 26,000 5,380,000 136,000  
Net income (loss) (5,284,000) 12,302,000 138,435,000 24,329,000  
Other Significant Items          
Equity method investment held by Urica 11,791,000 15,075,000 11,791,000 15,075,000  
Segment assets 160,155,000 73,131,000 160,155,000 73,131,000  
Stock-based compensation - Research & development 22,000 120,000 51,000 1,371,000  
Stock-based compensation - Selling, general and administrative 745,000 1,037,000 2,758,000 5,670,000  
Intersegment Activity | Avenue          
Operating expenses          
Research and development 63,000 63,000 188,000 188,000  
Selling, general and administrative 63,000 63,000 188,000 242,000  
Intersegment Activity | Checkpoint          
Operating expenses          
Selling, general and administrative       261,000  
Intersegment Activity | Mustang          
Operating expenses          
Research and development 63,000 63,000 188,000 125,000  
Selling, general and administrative 63,000 242,000 188,000 519,000  
Intersegment Activity | Fortress          
Operating expenses          
Research and development (125,000) (125,000) (375,000) (313,000)  
Selling, general and administrative $ (125,000) $ (304,000) $ (375,000) $ (1,022,000)