Common stock warrant activity during the periods indicated is as follows:
| Number of shares subject to warrants |
Weighted average exercise price |
Weighted average remaining contractual term (years) |
Aggregate intrinsic value |
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|
Balance at January 1, 2011 |
22,559 | $ | 0.76 | 8.83 | $ | 23 | ||||||||||
|
Granted |
328,700 | 1.80 | ||||||||||||||
|
Exercised |
(211,530 | ) | 1.72 | |||||||||||||
|
Balance at December 31, 2011 |
139,729 | $ | 1.80 | 6.02 | $ | 866 | ||||||||||
|
Balance at December 31, 2012 |
139,729 | $ | 1.80 | 5.02 | $ | 1,006 | ||||||||||
|
Exercised |
(14,729 | ) | 1.80 | |||||||||||||
|
Repurchased |
(125,000 | ) | 1.80 | |||||||||||||
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Balance at December 31, 2013 |
— | — | — | — | ||||||||||||
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