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Summary of significant accounting policies - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 22, 2017
Mar. 31, 2025
USD ($)
segment
Mar. 31, 2024
USD ($)
segment
Dec. 31, 2025
USD ($)
Dec. 31, 2028
USD ($)
Jul. 01, 2027
USD ($)
Jul. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Number of reporting segments | segment   1 1          
Number of operating segments | segment   1 1          
Allowance for credit loss   $ 0 $ 0          
Increase in allowance for credit losses   0 $ 0          
Allowance for doubtful accounts receivable   4,300           $ 2,300
Bad debt expense   1,900            
Income taxes                
Federal income tax statutory rate 21.00%              
Gain (loss) on sale of fixed assets   (77)            
Forecast                
Income taxes                
Increase in current taxable income resulting from the elimination of current deduction of qualifying R&D costs under Section 174.       $ 45,300        
Deposits and other assets                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Bank guarantee denominated in foreign currency   600            
Hopewell Campus                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Letters of credit             $ 3,000  
Hopewell Campus | Deposits and other assets                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Letters of credit   5,000            
Warren Building under lease amendment                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Letters of credit         $ 2,500 $ 5,000    
Warren Building under lease amendment | Deposits and other assets                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Letters of credit   $ 10,000