Quarterly report pursuant to sections 13 or 15(d)

5. Stock options and warrants (Details 2)

v2.4.0.6
5. Stock options and warrants (Details 2) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Warrant [Member]
Beginning Balance 17,198,598 28,049,558 42,205,507
Granted     150,000
Exercised     (14,344,600)
Forfeited or expired     (958,723)
Ending Balance 17,198,598 28,049,558 27,052,184
Vested and exercisable     25,685,517
Weighted Average Exercise Price, Outstanding Beggining Balance     $ 0.31
Weighted Average Exercise Price, Granted     $ 0.3
Weighted Average Exercise Price, Exercised     $ 0.29
Weighted Average Exercise Price, Forfeited or expired     $ 0.35
Weighted Average Exercise Price, Outstanding Ending Balance     $ 0.32
Weighted Average Exercise Price, Vested and exercisable     $ 0.32
Weighted-Average Remaining Contractual Term, Outstanding     1 year 9 months 18 days
Weighted-Average Remaining Contractual Term, Vested and exercisable     1 year 6 months
Aggregate Intrinsic Value, Outstanding     $ 18,752,321
Aggregate Intrinsic Value, Vested and exercisable     $ 17,781,988