| Warrants |
Number of Warrants |
Weighted- Average Exercise Price |
||||||
|
Outstanding at December 31, 2012 |
4,200,000 | $ | 2.98 | |||||
|
Granted |
510,204 | $ | 1.96 | |||||
|
Exercised |
(1,002,147 | ) | $ | 2.75 | ||||
|
Forfeited or expired |
(596,367 | ) | $ | 2.75 | ||||
|
Outstanding at December 31, 2013 |
3,111,690 | $ | 2.61 | |||||
|
Exercisable at December 31, 2013 |
3,111,690 | $ | 2.61 | |||||