Annual report pursuant to section 13 and 15(d)

9. Stock options and warrants (Details Narrative)

v2.4.0.8
9. Stock options and warrants (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Options
     
Option shares available for grant 2,201,759    
Aggregate intrinsic value of options outstanding $ 16,060,907    
Future unamortized compensation expense on unvested outstanding options 705,500    
Compensation cost amortized 403,127 1,366,846 8,058
Weighted average fair value for options granted $ 0.96 $ 0.30 $ 0.37
Warrants
     
Compensation cost amortized 97,242   84,694
Aggregate intrinsic value of warrants outstanding 8,585,149    
Future unamortized compensation expense on unvested warrants 162,500    
Proceeds from warrants exercised 8,408,718    
Compensation cost on the vesting of warrants granted 84,694    
Unamortized compensation expense 8,600    
Amortization expense on warrants vested   $ 289,513 $ 411,888