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Warrants
 12 Months Ended
Dec. 31, 2013
Warrants  
Warrants

15. Warrants

        Warrants granted are generally issued for services performed by third parties or investors.

        A summary of warrant activity during the year ended December 31, 2013 is as follows:

 
   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  
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                         

        The exercise prices range from $0.25 to $5.50 for warrants outstanding and exercisable as of December 31, 2013.

 
   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  

        On December 17, 2012, Inter-Atlantic Fund L.P. exercised its warrant in accordance with its terms and as a result, 917,602 new shares of common stock were issued to Inter-Atlantic. The warrant was net exercised under which 464,115 shares subject to the warrant were cancelled as payment for the shares being issued.

        In 2013, various parties exercised their warrants in accordance with its terms and as a result 213,123 new shares of common stock were issued. The warrants were net exercised under which 34,827 shares subject to the warrant were cancelled as payment for the shares being issued.

        The aggregate intrinsic value of warrants outstanding, vested and unvested expected to vest, and exercisable, represent the total pre-tax intrinsic value, based on the closing prices of $2.78 and $3.48 of PLPM as reported on NASDAQ on December 31, 2013 and 2012, respectively, and $2.27 of PPTR as reported on AIM on December 31, 2011.