5. Stock options and warrants (Details 3) (Warrant [Member], USD $)
|
6 Months Ended | |
---|---|---|
Jun. 30, 2013
|
Dec. 31, 2012
|
|
Outstanding Warrants | ||
Shares | 21,489,654 | 42,205,507 |
Life (Years) | 2 years | |
Weighted Average Exercise Price | $ 0.32 | $ 0.31 |
Exercisable Warrants | ||
Shares | 20,206,320 | |
Weighted Average Exercise Price | $ 0.32 | |
$ 0.25 - $ 0.99 [Member]
|
||
Outstanding Warrants | ||
Shares | 20,989,654 | |
Life (Years) | 2 years | |
Weighted Average Exercise Price | $ 0.3 | |
Exercisable Warrants | ||
Shares | 19,706,320 | |
Weighted Average Exercise Price | $ 0.3 | |
$1.00 - $1.99 [Member]
|
||
Outstanding Warrants | ||
Shares | 500,000 | |
Life (Years) | 1 year | |
Weighted Average Exercise Price | $ 1 | |
Exercisable Warrants | ||
Shares | 500,000 | |
Weighted Average Exercise Price | $ 1 |