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11. Stockholder's Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Equity [Abstract] |
Common Stock Warrants |
|  | Number of Warrants |  |  | Exercise Prices |
Balance, December 31, 2013 |  |  | 2,489,407 |  |  | $ | 0.25 - $4.50 |
Warrants exercised |  |  | (310,625 | ) |  | $ | 1.20-$1.60 |
Warrants expired |  |  | (1,451,865 | ) |  |  |  |
Balance, December 31, 2014 |  |  | 726,917 |  |  | $ | 0.25 - $4.50 |
Warrants expired |  |  | (476,917 | ) |  |  |  |
Balance, December 31, 2015 |  |  | 250,000 |  |  | $ | 0.25 |

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- References No definition available. + Details
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