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Share-Based compensation - Weighted Average Contractual Life and Exercise Price (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options      
Options outstanding 5,329,515 7,042,377 4,415,397
Options vested 5,261,947 5,922,377  
Options unvested 67,568 1,120,000  
Weighted Average Exercise Price      
Options outstanding $ 1.06 $ 1.01 $ 1.20
Options vested 1.05 1.06  
Options unvested $ 1.23 $ 0.75  
Employee Stock Option [Member]      
Number of Options      
Options vested 187,132    
Employee Stock Option [Member]      
Weighted Average Remaining Contractual Life      
Options outstanding 3 years 6 months 18 days 5 years  
Options vested 3 years 6 months 15 days 4 years  
Options unvested 4 years 8 months 16 days 10 years