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Net loss per share (Details 2) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net loss per share    
Total shares excluded from calculation 6,488,359 4,992,803
Stock Options    
Net loss per share    
Total shares excluded from calculation 6,034,918 4,627,833
Unvested restricted stock awards and units    
Net loss per share    
Total shares excluded from calculation 453,441 364,970