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Stock Based Compensation - Assumptions (Details)
6 Months Ended
Jun. 30, 2022
Share-based compensation  
Expected stock price volatility, minimum 80.70%
Expected stock price volatility, maximum 85.20%
Risk free interest rate, minimum 1.72%
Risk free interest rate, maximum 3.08%
Minimum  
Share-based compensation  
Expected life of options (years) 5 years 6 months
Maximum  
Share-based compensation  
Expected life of options (years) 5 years 9 months 18 days