v3.26.1
Leases (FY) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 04, 2024
USD ($)
ft²
Feb. 20, 2024
USD ($)
ft²
Sep. 29, 2023
USD ($)
ft²
Aug. 07, 2023
USD ($)
ft²
Jan. 31, 2025
Mar. 31, 2026
USD ($)
ft²
item
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
ft²
item
Dec. 31, 2024
USD ($)
Lessee, Lease, Description [Line Items]                  
Sublease Income           $ 356 $ 367 $ 1,467 $ 987
Impairment of long-lived assets             2,637 6,145 5,233
Impairment expenses for right of use assets           0 $ 0 2,633 2,516
Impairment expenses for property and equipment               3,373 2,279
Impairment of certain other assets               139 438
Future minimum lease payments                  
2026           1,233   3,757  
2027           1,270   3,863  
2028           1,308   3,973  
2029           1,348   4,085  
2030               4,200  
Thereafter               17,421  
Total undiscounted lease payments           7,447   37,299  
Less: imputed interest           (1,692)   (13,289)  
Total lease liabilities           $ 5,755   $ 24,010  
Employee Severance                  
Lessee, Lease, Description [Line Items]                  
Number of positions eliminated, period percent         55.00%        
Operating leases for office space                  
Lessee, Lease, Description [Line Items]                  
Area leased | ft²           37,000   37,000  
Option to extend lease           true   true  
Number of extension terms | item           2   2  
Renewal term of lease           5 years   5 years  
Option to terminate lease           true   true  
Notice Period for termination lease           15 months   15 months  
Sublease Agreement A                  
Lessee, Lease, Description [Line Items]                  
Area leased | ft²       8,000          
Option to extend lease       true          
Sublease Income       $ 100          
Annual increase in sublease rent (as a percent)       2.75%          
Sublease Agreement B                  
Lessee, Lease, Description [Line Items]                  
Area leased | ft²     29,000            
Option to extend lease     true            
Sublease Income     $ 900            
1835 market street sublease agreement                  
Lessee, Lease, Description [Line Items]                  
Area leased | ft²   16,000              
Option to extend lease   true              
Sublease Income   $ 300              
Term of Contract   18 months              
Operating leases for laboratory space                  
Lessee, Lease, Description [Line Items]                  
Option to terminate lease               true  
Notice Period for termination lease               12 months  
Sublease Agreement C                  
Lessee, Lease, Description [Line Items]                  
Area Subleased | ft² 3,200                
Subleased area of land 5.00%                
Area leased | ft² 62,000                
Sublease Income $ 100                
Annual increase in sublease rent (as a percent) 2.50%                
Impairment of long-lived assets               $ 3,500 5,200
Impairment expenses for right of use assets               2,600 2,500
Impairment expenses for property and equipment                 2,300
Impairment of certain other assets                 $ 400
Impairment of leasehold improvements               $ 900  
Maximum | Operating leases for laboratory space                  
Lessee, Lease, Description [Line Items]                  
Number of extension terms | item           2   2  
Extended term of new lease agreement           5 years   5 years