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Share-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]      
Number of Options, Beginning Balance 50,427,065 40,028,465  
Number of Options, Granted 7,900,000 19,190,960  
Number of Options, Exercised (2,737,326)    
Number of Options, Forfeited/ Expired (1,306,987) (8,792,360)  
Number of Options, Ending Balance 54,282,752 50,427,065 40,028,465
Weighted Average Price, Beginning Balance $ 0.84 $ 0.86  
Weighted Average Price, Granted 1.62 0.90  
Weighted Average Price, Exercised 1.04    
Weighted Average Price, Forfeited/ Expired 0.43 1.04  
Weighted Average Price, Ending Balance $ 0.94 $ 0.84 $ 0.86
Weighted Average Years 2 years 11 months 19 days 3 years 8 months 19 days 4 years 1 month 13 days
Weighted Average Years, Granted 5 years 5 years