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Significant accounting policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Gain (Loss) on Securities [Line Items]      
Company contributed segregated account representing loss $ 25,000,000.0    
Total revenue 75,128,000 $ 28,833,000 $ 38,025,000
Cash 99,300,000 127,100,000  
Cash equivalents 29,300,000 29,200,000  
Restricted cash 26,700,000 27,300,000  
Restricted cash current 25,000,000 25,000,000  
Restricted cash current within other current assets 1,500,000 2,100,000  
Restricted cash noncurrent 200,000 200,000  
Marketable securities unrealized fair value (losses) gains 800,000 800,000 2,100,000
Non-marketable securities 32,500,000 32,300,000  
Fair value gains $ 200,000 16,600,000 1,800,000
Number of reportable segments | segment 1    
Number of operating segments | segment 1    
Goodwill $ 47,806,000 47,806,000  
Accumulated impairment 0 0  
License      
Gain (Loss) on Securities [Line Items]      
Total revenue 46,920,000 1,049,000 969,000
License | Settled Litigation      
Gain (Loss) on Securities [Line Items]      
Total revenue 36,000,000.0    
Settlement receivable 36,000,000.0    
Canada      
Gain (Loss) on Securities [Line Items]      
Total revenue 64,000,000.0 26,200,000 36,000,000.0
Long-term assets 81,000,000.0 505,100,000  
Additions to property and equipment 36,600,000 9,000,000.0 164,000,000.0
United States      
Gain (Loss) on Securities [Line Items]      
Total revenue 11,100,000 2,700,000 2,000,000.0
Long-term assets 532,100,000 85,700,000  
Other Foreign Countries      
Gain (Loss) on Securities [Line Items]      
Long-term assets 15,600,000 18,400,000  
Research and development expense $ 0 $ 0 $ 22,800,000