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Share incentive plan (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation $ 700 $ 2,623 $ 736
Research and development expenses [Member]      
Share-based Compensation 531 381 83
Pre-commercialization expenses [Member]      
Share-based Compensation (147) 159 0
General and administrative expenses [Member]      
Share-based Compensation $ 316 $ 2,083 $ 653