| | Warrants | | Weighted Average Exercise Price | | |
Outstanding at January 1, 2013 | | 1,733,599 | | $ | 3.38 | |
Cancelled | | (1,733,599) | | | 3.38 | |
Assumed from merger | | 81,237 | | | 63.33 | |
Granted | | 251,044 | | | 2.27 | |
Outstanding at December 31, 2013 | | 332,281 | | $ | 17.20 | |