|
Warrants for Number of Shares |
Weighted-Average Exercise Price |
|||||||
|
Outstanding at January 1, 2012 |
4,106,016 | $ | 3.57 | |||||
|
Issued |
— | — | ||||||
|
Exercised |
(472,222 | ) | (0.60 | ) | ||||
|
Cancelled/expired |
(235,749 | ) | (40.32 | ) | ||||
|
Outstanding at December 31, 2012 |
3,398,045 | 1.36 | ||||||
|
Issued |
6,250,000 | 0.02 | ||||||
|
Exercised |
— | — | ||||||
|
Cancelled/expired |
— | — | ||||||
|
Outstanding at December 31, 2013 |
9,648,045 | $ | 0.49 | |||||