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Share-Based compensation - Weighted Average Contractual Life and Exercise Price (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Options      
Options outstanding 7,042,377 4,415,397 3,069,440
Options vested 5,922,377 2,258,338  
Options unvested 1,120,000 2,157,059  
Weighted Average Exercise Price      
Options outstanding $ 1.01 $ 1.20 $ 4.28
Options vested 1.06 1.29  
Options unvested $ 0.75 $ 1.10  
Employee Stock Option [Member]      
Number of Options      
Options vested 2,100,000    
Employee Stock Option [Member]      
Weighted Average Remaining Contractual Life      
Options outstanding 5 years 2 years 8 months 12 days  
Options vested 4 years 2 years 7 months 6 days  
Options unvested 10 years 2 years 10 months 24 days