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Stock Options Plans (Tables) | 6 Months Ended
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Jun. 30, 2013
Stock Options Plans [Abstract] |
Stock option activity | Options granted under the Plans vest as determined by the Company’s Compensation and Stock Option Committee and expire over varying terms, but not more than ten years from the date of grant. Stock option activity for the six months ended June 30, 2013 is as follows:
|  | Stock Option Activity under the Plans |
|  | Stock Options |  |  | Exercise Price per Share |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Life (Years) |
Outstanding at December 31, 2012 |  |  | 4,788,887 |  |  | $ | 1.23-$15.54 |  |  | $ | 4.79 |  |  |  | 6.88 |
Granted |  |  | 923,220 |  |  | $ | 0.46-$2.13 |  |  |  | 2.08 |  |  |  |  |
Forfeited |  |  | (517,441 | ) |  | $ | 1.31-$8.50 |  |  |  | 3.45 |  |  |  |  |
Expired |  |  | (20,000 | ) |  | $ | 1.87-$1.87 |  |  |  | 1.87 |  |  |  |  |
Outstanding at June 30, 2013 |  |  | 5,174,666 |  |  | $ | 0.46-$15.54 |  |  | $ | 4.45 |  |  |  | 6.75 |
Assumptions used to determine the fair value of stock options | The assumptions used in the option pricing model to determine the fair value of stock options awarded to employees are as follows:
|  | Six Months Ended June 30,
|  | 2013 |  | 2012
Dividend yield |  | None |  | None
Expected volatility |  | 86.16%-93.68% |  | 77.37% - 80.3%
Weighted average volatility |  | 86.21% |  | 78.91%
Risk-free interest rates |  | 0.99%-1.36% |  | 0.78% - 1.49%
Expected life (in years) |  | 6.8 |  | 6.0
Restricted stock activity | Restricted stock activity for the six months ended June 30, 2013 is as follows:
|  | Restricted Stock Activity under the Plans |
|  | Restricted Stock |  |  | Weighted Average Grant Date Fair Value |
Non-vested at December 31, 2012 |  |  | 501,468 |  |  | $ | 3.26 |
Granted |  |  | 259,750 |  |  |  | 0.43 |
Vested |  |  | (307,488 | ) |  |  | 2.54 |
Forfeited |  |  | (56,985 | ) |  |  | 4.18 |
Non-vested at June 30, 2013 |  |  | 396,745 |  |  | $ | 1.82 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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