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Warrants (Tables)
12 Months Ended
Dec. 31, 2013
Warrants  
Summary of warrant activity

 

 
  Number of
warrants
  Weighted-
average
exercise
price
  Weighted-
average
remaining
contractual
life (in years)
  Aggregate
intrinsic
value
 

Outstanding as of December 31, 2012

    726,858   $ 2.29     1.26   $ 1,236,845  
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Warrants granted

    —     —              

Warrants exercised

    (247,950 )   0.38              

Warrants cancelled

    (257,008 )   3.94              

Warrants forfeited

    —     —              
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding as of December 31, 2013

    221,900     2.50     0.34     224,707  
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                         

Warrants exercisable as of December 31, 2013

    221,900     2.50     0.34     224,707  
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                         

Vested and expected to vest as of December 31, 2013

    221,900     2.50     0.34     224,707  
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                         
Schedule of additional information related to warrants

 

 
  Year ended December 31,  
 
  2013   2012   2011  

Weighted-average grant date fair value for warrants granted during the period

  $ —   $ —   $ 2.83  

Total fair value of warrants vested during the period

    —     —     11,254  

Total intrinsic value of warrants exercised during the period

    594,002     2,376,589     26,975