Common stock (Tables)
12 Months Ended
Dec. 31, 2014
Common stock.  
Schedule of shares of common stock reserved for the issuance of common stock for vested restricted stock units and the exercise of stock options

        As of December 31, 2013 and 2014, the Company had reserved the following shares of common stock for the issuance of common stock for vested restricted stock units, the exercise of stock options, and an outstanding warrant (in thousands):

                                                                                                                                                                                    

 

 

December 31,
2013

 

December 31,
2014

 

Shares reserved under equity compensation plans

 

 

4,330 

 

 

4,508 

 

Shares reserved for inducement grants

 

 

 

 

750 

 

Shares reserved for outstanding warrants

 

 

 

 

143 

 

​  

​  

​  

​  

 

 

 

4,330 

 

 

5,401 

 

​  

​  

​  

​  

​  

​  

​  

​  

​