v3.26.1
Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Revenue          
Product revenue, net $ 17,839 $ 15,009 $ 33,760 $ 28,148  
Other revenue 879 1,404 996 1,404  
Net revenue 18,718 16,413 34,756 29,552  
Operating expenses          
Cost of goods - (excluding amortization of acquired intangible assets) 6,143 4,939 12,361 9,729  
Amortization of acquired intangible assets 969 1,064 2,095 2,129  
Research and development 805 8,126 1,345 12,060  
Selling, general and administrative 20,807 38,757 36,699 64,424  
Total operating expenses 28,724 52,886 52,500 88,342  
Loss from operations (10,006) (36,473) (17,744) (58,790)  
Other income (expense)          
Interest income 1,581 622 2,151 1,112  
Interest expense and financing fee (1,476) (2,518) (4,845) (5,324)  
Gain on sale of priority review voucher, net of expenses     158,873    
Change in fair value of partner company derivative liability     (7,085)    
Gain (loss) on common stock warrant liabilities   (350) 1 (397)  
Gain from deconsolidation of subsidiary (82) (27,127) (82) (27,127)  
Other income (expense) 10,741 (62) 11,783 (73)  
Total other income (expense) 10,928 24,819 160,960 22,445  
Income (loss) before income tax expense 922 (11,654) 143,216 (36,345)  
Income tax expense 320   5,452    
Net income (loss) 602 (11,654) 137,764 (36,345)  
Attributable to non-controlling interests (1,070) 27,140 (27,859) 41,247  
Net income (loss) attributable to Fortress (468) 15,486 109,905 4,902  
Other Significant Items          
Change in fair value of investment 10,745   11,791    
Segment assets 316,715 159,895 316,715 159,895 $ 185,548
Stock-based compensation - Research & development 35 4,751 60 6,093  
Stock-based compensation - Selling, general and administrative 2,843 12,042 $ 4,574 16,989  
Number of reportable segments not disclosed flag     true    
Journey          
Revenue          
Product revenue, net 17,839 15,009 $ 33,760 28,148  
Other revenue 671   711    
Net revenue 18,510 15,009 34,471 28,148  
Operating expenses          
Cost of goods - (excluding amortization of acquired intangible assets) 6,143 4,939 12,361 9,729  
Amortization of acquired intangible assets 969 1,064 2,095 2,129  
Research and development 54   54 39  
Selling, general and administrative 10,888 11,942 20,997 22,511  
Total operating expenses 18,054 17,945 35,507 34,408  
Loss from operations 456 (2,936) (1,036) (6,260)  
Other income (expense)          
Interest income 154 138 311 287  
Interest expense and financing fee (906) (937) (1,798) (1,828)  
Other income (expense) (1) (61) (4) (68)  
Total other income (expense) (753) (860) (1,491) (1,609)  
Income (loss) before income tax expense (297)   (2,527)    
Income tax expense 15   15    
Net income (loss) (312) (3,796) (2,542) (7,869)  
Other Significant Items          
Segment assets 98,356 81,158 98,356 81,158  
Stock-based compensation - Selling, general and administrative 1,437 1,336 2,426 2,659  
Avenue          
Revenue          
Other revenue   1,404   1,404  
Net revenue   1,404   1,404  
Operating expenses          
Research and development 247 192 447 603  
Selling, general and administrative 460 915 974 2,408  
Total operating expenses 707 1,107 1,421 3,011  
Loss from operations (707) 297 (1,421) (1,607)  
Other income (expense)          
Interest income 17 31 35 62  
Gain (loss) on common stock warrant liabilities   1 1 16  
Total other income (expense) 17 32 36 78  
Income (loss) before income tax expense (690)   (1,385)    
Net income (loss) (690) 329 (1,385) (1,529)  
Other Significant Items          
Segment assets 1,976 4,161 1,976 4,161  
Stock-based compensation - Research & development 15 31 29 71  
Stock-based compensation - Selling, general and administrative 46 144 93 289  
Checkpoint          
Operating expenses          
Research and development   6,986   10,775  
Selling, general and administrative   19,902   27,263  
Total operating expenses   26,888   38,038  
Loss from operations   (26,888)   (38,038)  
Other income (expense)          
Interest income   89   90  
Gain (loss) on common stock warrant liabilities   (46)   (108)  
Other income (expense)   (1)   (3)  
Total other income (expense)   42   (21)  
Net income (loss)   (26,846)   (38,059)  
Other Significant Items          
Stock-based compensation - Research & development   4,093   4,782  
Stock-based compensation - Selling, general and administrative   8,048   9,315  
Mustang          
Operating expenses          
Research and development 224 98 402 (866)  
Selling, general and administrative 946 787 1,826 2,004  
Total operating expenses 1,170 885 2,228 1,138  
Loss from operations (1,170) (885) (2,228) (1,138)  
Other income (expense)          
Interest income 98 123 201 223  
Total other income (expense) 98 123 201 223  
Income (loss) before income tax expense (1,072)   (2,027)    
Net income (loss) (1,072) (762) (2,027) (915)  
Other Significant Items          
Segment assets 15,613 13,046 15,613 13,046  
Stock-based compensation - Research & development       (11)  
Stock-based compensation - Selling, general and administrative 21 45 43 94  
Fortress          
Revenue          
Other revenue 208   285    
Net revenue 208   285    
Operating expenses          
Research and development 280 850 442 1,509  
Selling, general and administrative 8,513 5,211 12,902 10,238  
Total operating expenses 8,793 6,061 13,344 11,747  
Loss from operations (8,585) (6,061) (13,059) (11,747)  
Other income (expense)          
Interest income 1,312 241 1,604 450  
Interest expense and financing fee (570) (1,581) (3,047) (3,496)  
Gain on sale of priority review voucher, net of expenses     158,873    
Change in fair value of partner company derivative liability     (7,085)    
Gain (loss) on common stock warrant liabilities   (305)   (305)  
Gain from deconsolidation of subsidiary (82) (27,127) (82) (27,127)  
Other income (expense) 10,742   11,787 (2)  
Total other income (expense) 11,566 25,482 162,214 23,774  
Income (loss) before income tax expense 2,981   149,155    
Income tax expense 305   5,437    
Net income (loss) 2,676 19,421 143,718 12,027  
Other Significant Items          
Change in fair value of investment 10,745   11,791    
Segment assets 200,770 61,529 200,770 61,529  
Stock-based compensation - Research & development 20 627 31 1,251  
Stock-based compensation - Selling, general and administrative 1,339 2,469 2,012 4,632  
Intersegment Activity | Avenue          
Operating expenses          
Research and development 63 63 125 125  
Selling, general and administrative 63 63 125 179  
Intersegment Activity | Checkpoint          
Operating expenses          
Selling, general and administrative   83   261  
Intersegment Activity | Mustang          
Operating expenses          
Research and development 63 63 125 125  
Selling, general and administrative 63 63 125 341  
Intersegment Activity | Fortress          
Operating expenses          
Research and development (125) (125) (250) (250)  
Selling, general and administrative $ (125) $ (208) $ (250) $ (573)