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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of assumptions used to value stock options granted to employees and directors |
For the Nine |
|  | Months Ended September 30, 2013 |
Annual dividend yield |  | -- |
Expected life (years) |  | 4.3 |
Risk-free interest rate |  | 0.65% - 1.33% |
Expected volatility |  | 135% - 1.54% |
|  | For the Nine |
|  | Months Ended September 30, 2012 |
Annual dividend yield |  | -- |
Expected life (years) |  | 3.85 |
Risk-free interest rate |  | 0.43% - 0.58% |
Expected volatility |  | 177% - 186% |
Summary of stock-based compensation expense |
| Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Product research and development |  | $ | 69 |  |  | $ | 73 |  |  | $ | 187 |  |  | $ | 260 |
Sales and marketing |  | $ | 364 |  |  |  | 250 |  |  |  | 749 |  |  |  | 1,200 |
General and administrative |  | $ | 329 |  |  |  | 284 |  |  |  | 1,165 |  |  |  | 1,497 |
Stock compensation expense |  | $ | 762 |  |  | $ | 607 |  |  | $ | 2,101 |  |  | $ | 2,957 |
|  | Remaining unamortized expense at September 30, 2013 |
Stock-based compensation |  | $ | 2,242 |
Summary of all warrant activity |
September 30, 2013 |
Outstanding and exercisable |  | Warrants |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life
January 1, 2013 |  |  | 4,704,636 |  |  | $ | 1.61 |  |  |  | 1.41 |
Issued |  |  | -- |  |  |  | -- |  |  |  | -- |
Expired/forfeited |  |  | -- |  |  |  | -- |  |  |  | -- |
Exercised |  |  | (3,871,063 | ) |  |  | 1.45 |  |  |  | -- |
Outstanding and exercisable, September 30, 2013 |  |  | 833,573 |  |  | $ | 2.40 |  |  |  | 2.31 |
Summary of outstanding warrants to purchase common stock |
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 |
January 2011 Employee Warrant |  | 1/21/2011 |  | $ | 2.00 |  | 7,000 |  | 1/21/2014 |
February 2011 Legal Advisor Warrant |  | 2/22/2011 |  | $ | 2.50 |  | 80,000 |  | 2/22/2016 |
March 2011 Investor Warrants |  | 3/9/2011 |  | $ | 3.13 |  | 376,473 |  | 3/9/2016 |
March 2011 Investor Warrants |  | 4/7/2011 |  | $ | 3.13 |  | 34,100 |  | 4/7/2016 |
May 2011 Consultant Warrant |  | 5/17/2011 |  | $ | 4.05 |  | 20,000 |  | 5/17/2014 |
September 2011 Employee Warrant |  | 9/12/2011 |  | $ | 3.90 |  | 20,000 |  | 9/12/2014 |
Total Warrants Outstanding |  |  |  |  |  |  | 833,573 |  |
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of all stock option plans / warrant activity |
|  | Number of Options Outstanding | Weighted Average Exercise Price |
Outstanding at January 1, 2013 |  |  | 1,715,200 |  |  | $ | 5.04 |
Granted |  |  | 130,000 |  |  |  | 6.12 |
Cancelled or expired |  |  | (18,256 | ) |  |  | 5.57 |
Exercised |  |  | (182,361 | ) |  |  | 4.44 |
Outstanding at September 30, 2013 |  |  | 1,644,583 |  |  | $ | 5.18 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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