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Net loss per share (Details 2)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net loss per share    
Total shares excluded from calculation 3,882,286 781,966
Stock Options
   
Net loss per share    
Total shares excluded from calculation 3,133,830 46,642
Unvested restricted stock
   
Net loss per share    
Total shares excluded from calculation 748,456 735,324