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Stock award plan - Assumptions Used (Details)
3 Months Ended
Mar. 31, 2023
Valuation assumptions  
Expected term (in years) 5 years 6 months
Stock option  
Valuation assumptions  
Expected volatility (as a percent) 54.00%
Stock option | Minimum  
Valuation assumptions  
Risk-free interest rate (as a percent) 3.54%
Stock option | Maximum  
Valuation assumptions  
Risk-free interest rate (as a percent) 3.88%