v3.25.3
Long-term debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 22, 2025
Jul. 19, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jan. 05, 2027
Jan. 01, 2027
Dec. 31, 2024
2024 Amended Facility                  
Long-term debt                  
Outstanding debt $ 50.0                
Floating rate 11.95%                
Interest rate (as a percent) 7.95%                
Variable interest rate basis 7.95%                
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember                
Discount rate (as a percent) 3.25%                
Foreign currency gain       $ 2.6          
Foreign currency loss           $ 0.4      
Interest expense recorded       $ 3.7   $ 11.1      
Outstanding principal amount   $ 50.0              
2025 Amended Facility                  
Long-term debt                  
Proceed from drew down $ 50.0                
Maximum borrowing capacity 125.0                
Outstanding debt     $ 50.0   $ 50.0        
Facility charge $ 0.2                
Interest rate (as a percent) 9.45%                
Variable interest rate basis 2.45%                
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember                
Current floating rate (in percent) 9.70%                
Minimum market capitalization threshold $ 1,200.0                
Amortized cost net of discount and debt issuance costs     52.4   52.4       $ 51.9
Foreign currency gain     2.8   9.2        
Interest expense recorded     $ 1.8   5.4        
2025 Amended Facility | Forecast                  
Long-term debt                  
Back-end fees             $ 0.6    
2025 Amended Facility | Prepayment within first 30 months following the amendment closing date                  
Long-term debt                  
Prepayment charge 1.50%                
2025 Amended Facility | Prepayment after first 30 months following amendment closing date                  
Long-term debt                  
Prepayment charge 0.75%                
2025 Amended Facility | Debt repayment within 18 months                  
Long-term debt                  
Percentage of fee charged at end of a debt term 2.75%                
2025 Amended Facility | Debt repayment after 18 months                  
Long-term debt                  
Percentage of fee charged at end of a debt term 5.50%                
2025 Amended Facility | Tranche two                  
Long-term debt                  
Additional amount the company has right to draw $ 100.0                
Number of increments 2                
Minimum amount drawn $ 25.0                
2025 Amended Facility | Tranche three                  
Long-term debt                  
Additional amount the company has right to draw $ 25.0                
Venture debt loan facility | 2025 Amended Facility                  
Long-term debt                  
Assets pledged to secure facilities by directly or indirectly         888.4        
Assets not being pledged to secure facilities by directly or indirectly         80.6        
Venture debt loan facility | 2025 Amended Facility | uniQure France                  
Long-term debt                  
Assets not being pledged to secure facilities by directly or indirectly         $ 88.7        
Subsequent events | 2025 Amended Facility                  
Long-term debt                  
Percentage of minimum cash balance in bank accounts               65.00%  
Worldwide cash and cash equivalents percentage               100.00%  
Subsequent events | 2025 Amended Facility | Approval of a Biologics License Application ("BLA") for AMT-130 prior to June 15, 2027                  
Long-term debt                  
Percentage of minimum cash balance in bank accounts               50.00%  
Subsequent events | 2025 Amended Facility | Occurrence of certain contractually defined commercial milestones                  
Long-term debt                  
Percentage of minimum cash balance in bank accounts               35.00%