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Stockholders' equity (Tables)
 12 Months Ended
Dec. 31, 2013
Stockholders' equity  
Schedule of amount of shares of common stock reserved

 

 

 
   December 31,
2013		   December 31,
2012		  
 
   (in thousands)
  

Outstanding stock options under the 2001 Plan

     1,859     2,345  

Outstanding stock options under the 2011 Plan

     3,096     2,700  

Outstanding RSUs under the 2011 Plan

     753     —  

Shares available for grant under the 2011 Plan

     3,259     2,811  
           
​ ​ ​ ​ ​ ​ ​ ​

Total

     8,967     7,856  
           
​ ​ ​ ​ ​ ​ ​ ​
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