Quarterly report pursuant to sections 13 or 15(d)

5. Stock options and warrants (Details)

v2.4.0.6
5. Stock options and warrants (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Option [Member]
Beginning Balance 17,198,598 28,049,558 27,278,098
Granted       
Exercised       
Forfeited or expired       
Ending Balance 17,198,598 28,049,558 27,278,098
Vested and exercisable     13,718,098
Weighted Average Exercise Price, Outstanding Beggining Balance     $ 0.27
Weighted Average Exercise Price, Granted       
Weighted Average Exercise Price, Exercised       
Weighted Average Exercise Price, Forfeited or expired       
Weighted Average Exercise Price, Outstanding Ending Balance     $ 0.27
Weighted Average Exercise Price, Vested and exercisable     $ 0.29
Weighted-Average Remaining Contractual Term, Outstanding     7 years 9 months 18 days
Weighted-Average Remaining Contractual Term, Vested and exercisable     7 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding     $ 20,254,356
Aggregate Intrinsic Value, Vested and exercisable     $ 9,948,756