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Share Capital - Stock Options (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2013
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation award, common stock for purchase, exercise price   1    
Options exercised (in shares)   162,944    
Proceeds from exercise of stock options   $ 100,000 $ 0 $ 0
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, weighted average remaining contractual term   3 years 3 years 2 months 12 days  
Weighted average remaining contractual term of exercisable stock options   2 years 2 months 12 days 1 year 10 months 24 days  
Weighted average grant date fair value for options granted (in USD per share)   $ 0.47 $ 0.29 $ 0.89
Weighted average grant date fair value for options vested (in USD per share)   $ 0.52 $ 0.79 $ 1.10
Total fair value of stock options vested   $ 2,100,000 $ 1,900,000 $ 1,900,000
Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options exercised (in shares)   162,944 0 0
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Expected term during grantee's service 5 years   5 years  
Expected term after end of grantee's service 3 months