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Share-Based Compensation - Summary of Stock Option Activity (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Options, Beginning Balance 50,427,065 40,028,465  
Number of Options, Granted 7,875,000 19,190,960  
Number of Options, Exercised (2,011,056)    
Number of Options, Forfeited   (8,792,360)  
Number of Options, Ending Balance 56,291,009 50,427,065 40,028,465
Weighted Average Price, Beginning Balance $ 0.84 $ 0.86  
Weighted Average Price, Granted 1.63 0.90  
Weighted Average Price, Exercised 0.93    
Weighted Average Price, Forfeited   1.04  
Weighted Average Price, Ending Balance $ 0.94 $ 0.84 $ 0.86
Weighted Average Years 3 years 5 months 26 days 3 years 8 months 19 days 4 years 1 month 13 days
Weighted Average Years,Granted 4 years 11 months 19 days    
Weighted Average Years,Exercised 4 years 11 months 19 days