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Net Loss Per Share (Detail Textuals) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Preferred shares      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of shares excluded from calculation of diluted net loss per share 116,321,133 116,321,133 97,465,835
Share options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of shares excluded from calculation of diluted net loss per share 18,817,362 18,817,362 20,634,496
Convertible loan      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of shares excluded from calculation of diluted net loss per share 7,569,628 7,569,628 6,261,743
Warrant      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of shares excluded from calculation of diluted net loss per share 670,814 670,814