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Share based compensation - Options Granted to Nonemployees (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share based compensation    
Number of options granted (in shares) 13,575,554 9,183,962
Nonemployees    
Share based compensation    
Number of options granted (in shares) 3,074,600  
Share based payment charge (benefit) $ (108) $ 528