The tables below summarize warrant activity for 2013 and assumptions utilized to value the warrants (in thousands except for per warrant data):
| Original Warrant Issue Date | ||||||||||||
| June 3, 2013 | November 15, 2013 |
Total as of December 31, 2013 |
||||||||||
|
Value of warrants issued |
$ | 4,392 | $ | 13,205 | $ | 17,597 | ||||||
|
Changes in fair value, net |
(175 | ) | (1,851 | ) | (2,026 | ) | ||||||
|
Value of warrants exercised |
(500 | ) | (500 | ) | ||||||||
|
|
|
|
|
|
|
|||||||
|
Value of warrants at December 31, 2013 |
$ | 3,717 | $ | 11,354 | $ | 15,071 | ||||||
|
|
|
|
|
|
|
|||||||
|
Number of warrants outstanding |
1,655 | 5,015 | 6,670 | |||||||||