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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of options outstanding by exercise price range |
Options Outstanding |  | Options Exercisable |
Range of Exercise Price |  | Number Outstanding at 12/31/14 |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Weighted Average Exercise Price |  |  | Number Exercisable at 12/31/14 |  |  | Weighted Average Exercise Price |
$ 2.08 - $ 3.50 |  |  | 70,200 |  |  |  | 6.70 |  |  | $ | 2.61 |  |  |  | - |  |  | $ | - |
$ 3.51 - $ 5.00 |  |  | 1,221,000 |  |  |  | 4.33 |  |  | $ | 4.24 |  |  |  | 1,211,834 |  |  | $ | 4.25 |
$ 5.01 - $ 6.50 |  |  | 245,000 |  |  |  | 5.57 |  |  | $ | 5.90 |  |  |  | 91,383 |  |  | $ | 5.62 |
$ 6.51 - $ 10.00 |  |  | 170,000 |  |  |  | 3.79 |  |  | $ | 7.83 |  |  |  | 138,334 |  |  | $ | 7.93 |
$ 10.01 - $ 86.25 |  |  | 3,200 |  |  |  | 0.01 |  |  | $ | 86.25 |  |  |  | 3,200 |  |  | $ | 86.25 |
|  |  | 1,709,400 |  |  |  | 4.54 |  |  | $ | 4.92 |  |  |  | 1,444,751 |  |  | $ | 4.87 |
Summary of assumptions used to value stock options granted to employees and directors |
|  | For the year
|  | ended December 31, 2014
Annual dividend yield |  | -
Expected life (years) |  | 3.5
Risk-free interest rate |  | 0.28% - 1.47%
Expected volatility |  | 60.68% - 108.75%
|  | For the year
|  | ended December 31, 2013
Annual dividend yield |  | -
Expected life (years) |  | 4.3
Risk-free interest rate |  | 0.65% - 2.15%
Expected volatility |  | 117% - 154%
|  | For the year
|  | ended December 31, 2012
Annual dividend yield |  | -
Expected life (years) |  | 3.8 - 4.3
Risk-free interest rate |  | 0.43% - 0.62%
Expected volatility |  | 169% - 187%
Summary of stock-based compensation expense |
|  | Years ended |
|  | December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Research and development |  | $ | 510 |  |  | $ | 267 |  |  | $ | 315 |
Sales and marketing |  |  | 353 |  |  |  | 909 |  |  |  | 1,407 |
General and administrative |  |  | 866 |  |  |  | 1,480 |  |  |  | 1,777 |
Stock compensation expense |  | $ | 1,729 |  |  | $ | 2,656 |  |  | $ | 3,499 |
|  |  | Remaining unamortized expense at December 31, 2014 |
| Stock-based compensation |  |  | $ | 880 |
Summary of all warrant activity |
Outstanding and exercisable |  | Warrants |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life |
January 1, 2012 |  |  | 5,405,606 |  |  | $ | 1.57 |  |  |  | 2.45 |
Issued |  |  | - |  |  |  | - |  |  |  | - |
Expired/forfeited |  |  | (232 | ) |  |  | 31.75 |  |  |  | - |
Exercised |  |  | (700,738 | ) |  |  | 1.18 |  |  |  | - |
December 31, 2012 |  |  | 4,704,636 |  |  |  | 1.61 |  |  |  | 1.41 |
Issued |  |  | - |  |  |  | - |  |  |  | - |
Expired/forfeited |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | (3,876,063 | ) |  |  | 1.45 |  |  |  | - |
December 31, 2013 |  |  | 828,573 |  |  |  | 2.39 |  |  |  | 2.06 |
Issued |  |  | 2,575,000 |  |  |  | 5.09 |  |  |  | - |
Expired/forfeited |  |  | (40,000 | ) |  |  | 3.98 |  |  |  | - |
Exercised |  |  | (28,500 | ) |  |  | 2.85 |  |  |  | - |
Outstanding and exercisable, December 31, 2014 |  |  | 3,335,073 |  |  | $ | 4.45 |  |  |  | 0.93 |
Employee Stock Option [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of all stock option plans / warrant activity |
|  | Weighted Average Number of Shares |  |  | Exercise Price Per Share |  |  | Weighted-Average Exercise Price |
Outstanding at January 1, 2012 |  |  | 19,324 |  |  | $ | 35.39 – 368.75 |  |  | $ | 92.19 |
Granted |  |  | 1,704,000 |  |  | $ | 4.02 – 6.28 |  |  | $ | 4.35 |
Cancelled or expired |  |  | (8,124 | ) |  | $ | 35.39 – 368.75 |  |  | $ | 69.36 |
Exercised |  |  | -- |  |  |  | -- |  |  | $ | -- |
Outstanding, vested and expected to vest at December 31, 2012 |  |  | 1,715,200 |  |  | $ | 4.02 – 125.00 |  |  | $ | 5.04 |
Granted |  |  | 145,000 |  |  | $ | 5.54 - 7.70 |  |  | $ | 6.06 |
Cancelled or expired |  |  | (18,256 | ) |  | $ | 4.25- 125.00 |  |  | $ | 5.57 |
Exercised |  |  | (241,361 | ) |  | $ | 4.25 – 6.28 |  |  | $ | 4.39 |
Outstanding, vested and expected to vest at December 31, 2013 |  |  | 1,600,583 |  |  | $ | 4.02 – 122.50 |  |  | $ | 5.22 |
Granted |  |  | 405,200 |  |  | $ | 2.08-8.21 |  |  | $ | 6.31 |
Cancelled or expired |  |  | (296,383 | ) |  | $ | 4.65- 122.50 |  |  | $ | 5.46 |
Exercised |  |  | -- |  |  | $ | -- |  |  | $ | -- |
Outstanding, vested and expected to vest at December 31, 2014 |  |  | 1,709,400 |  |  | $ | 2.08 – 86.25 |  |  | $ | 4.92 |
Warrant [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of all stock option plans / warrant activity |
Description |  | Issue Date |  |  | Exercise Price |  |  | Shares |  |  | Expiration Date |
August 2009 Employee Warrants |  |  | 8/25/2009 |  |  | $ | 0.50 |  |  |  | 80,000 |  |  |  | 8/25/2016 |
2007 Debt Extension Warrants |  |  | 9/22/2010 |  |  | $ | 1.00 |  |  |  | 16,000 |  |  |  | 9/22/2015 |
December 2010 Employee Warrants |  |  | 12/3/2010 |  |  | $ | 1.63 |  |  |  | 200,000 |  |  |  | 12/3/2015 |
February 2011 Legal Advisor Warrant |  |  | 2/22/2011 |  |  | $ | 2.50 |  |  |  | 80,000 |  |  |  | 2/22/2016 |
March 2011 Investor Warrants |  |  | 3/9/2011 |  |  | $ | 3.13 |  |  |  | 349,973 |  |  |  | 3/9/2016 |
March 2011 Investor Warrants |  |  | 4/7/2011 |  |  | $ | 3.13 |  |  |  | 34,100 |  |  |  | 4/7/2016 |
May 2014 Agent Warrant |  |  | 5/15/2014 |  |  | $ | 5.09 |  |  |  | 75,000 |  |  |  | 11/15/2015 |
May 2014 Investor Warrant |  |  | 5/15/2014 |  |  | $ | 5.09 |  |  |  | 2,500,000 |  |  |  | 11/15/2015 |
Total Warrants Outstanding |  |  |  |  |  |  |  |  |  |  | 3,335,073 |  |  |  |  |

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