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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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 2013, 2012, and 2011 is as follows:
|  | Number of Options |  |  | Exercise Price per Share |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Life (Years) |
Outstanding at December 31, 2010 |  |  | 3,760,650 |  |  | $ | 1.23-15.54 |  |  | $ | 4.88 |  |  |  | 6.65 |
Granted |  |  | 671,326 |  |  |  | 2.00-9.18 |  |  |  | 5.72 |  |  |  |  |
Expired |  |  | (120,000 | ) |  |  | 3.28 |  |  |  | 3.28 |  |  |  |  |
Forfeited |  |  | (136,900 | ) |  |  | 1.40-9.93 |  |  |  | 4.65 |  |  |  |  |
Exercised |  |  | (45,327 | ) |  |  | 2.44-3.28 |  |  |  | 3.18 |  |  |  |  |
Outstanding at December 31, 2011 |  |  | 4,129,749 |  |  | $ | 1.23-15.54 |  |  | $ | 5.09 |  |  |  | 6.38 |
Granted |  |  | 1,207,452 |  |  |  | 1.43-4.60 |  |  |  | 3.80 |  |  |  |  |
Expired |  |  | (420,000 | ) |  |  | 1.88-5.85 |  |  |  | 4.81 |  |  |  |  |
Forfeited |  |  | (128,314 | ) |  |  | 2.26-9.18 |  |  |  | 5.05 |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 4,788,887 |  |  | $ | 1.23-15.54 |  |  | $ | 4.79 |  |  |  | 6.88 |
Granted |  |  | 2,085,717 |  |  |  | 0.30-2.13 |  |  |  | 1.09 |  |  |  |  |
Expired |  |  | (270,000 | ) |  |  | 1.23-1.87 |  |  |  | 1.53 |  |  |  |  |
Forfeited |  |  | (2,569,461 | ) |  |  | 0.38-12.34 |  |  |  | 3.97 |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 4,035,143 |  |  | $ | 0.30-15.54 |  |  | $ | 3.62 |  |  |  | 2.13 |
Exercisable at December 31, 2013 |  |  | 2,136,785 |  |  | $ | 1.24-15.54 |  |  | $ | 5.68 |  |  |  | 5.56 |
Non-vested options | A summary of the Company’s non-vested options to purchase shares as of December 31, 2013 and changes during the year ended December 31, 2013 and December 31, 2012 are presented below:
|  | Non-Vested Options |
|  | Number of Options |  |  | Weighted Average Exercise Price |
Non-vested at December 31, 2011 |  |  | 1,158,368 |  |  | $ | 6.44 |
Granted |  |  | 1,207,452 |  |  |  | 3.80 |
Vested |  |  | (570,518 | ) |  |  | 6.38 |
Forfeited |  |  | (111,950 | ) |  |  | 4.79 |
Non-vested at December 31, 2012 |  |  | 1,683,352 |  |  | $ | 4.68 |
Granted |  |  | 2,085,717 |  |  |  | 1.09 |
Vested |  |  | (686,232 | ) |  |  | 5.38 |
Forfeited |  |  | (1,184,479 | ) |  |  | 3.37 |
Non-vested at December 31, 2013 |  |  | 1,898,358 |  |  |  | 1.30 |
Restricted stock activity | A summary of the Company’s restricted stock activity as of December 31, 2013 and changes during the year ended December 31, 2013 and December 31, 2012 are presented below:
|  | Restricted Stock Activity |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested at December 31, 2011 |  |  | 193,532 |  |  | $ | 5.84 |
Granted |  |  | 429,720 |  |  |  | 2.83 |
Vested |  |  | (100,751 | ) |  |  | 6.18 |
Forfeited |  |  | (21,033 | ) |  |  | 4.39 |
Non-vested at December 31, 2012 |  |  | 501,468 |  |  | $ | 3.26 |
Granted |  |  | 276,250 |  |  |  | 0.42 |
Vested |  |  | (313,395 | ) |  |  | 2.57 |
Forfeited |  |  | (138,601 | ) |  |  | 4.32 |
Non-vested at December 31, 2013 |  |  | 325,722 |  |  | $ | 1.05 |
Warrant activity | A summary of warrant activity is as follows:
|  | Warrants |  |  | Exercise Price per Share |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Life (Years) |
Outstanding at December 31, 2010 |  |  | 2,512,934 |  |  | $ | 3.44-3.60 |  |  | $ | 3.51 |  |  |  | 2.45 |
Issued |  |  | – |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | – |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | – |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2011 |  |  | 2,512,934 |  |  | $ | 3.44-3.60 |  |  | $ | 3.51 |  |  |  | 1.45 |
Issued |  |  | 6,523,120 |  |  |  | 1.49-3.03 |  |  |  | 1.65 |  |  |  |  |
Exercised |  |  | (2,975,457 | ) |  |  | 1.49-1.65 |  |  |  | 1.49 |  |  |  |  |
Expired |  |  | (418,017 | ) |  |  | 1.49 |  |  |  | 1.49 |  |  |  |  |
Outstanding at December 31, 2012 |  |  | 5,642,580 |  |  | $ | 1.20 |  |  | $ | 1.20 |  |  |  | 2.24 |
Issued |  |  | 9,432,000 |  |  |  | 0.44 |  |  |  | 0.44 |  |  |  |  |
Exercised |  |  | (202,689 | ) |  |  | 1.20 |  |  |  | 1.20 |  |  |  |  |
Expired |  |  | – |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 14,871,891 |  |  | $ | 0.16-0.44 |  |  | $ | 0.34 |  |  |  | 3.51 |
Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions used to determine the fair value of stock options | The estimated fair value of each option award granted was determined on the date of grant using an option pricing model with the following assumptions for option grants during the years ended December 31, 2013, 2012 and 2011:
|  | Year Ended December 31, |
|  | 2013 |  |  | 2012 |  |  | 2011 |
Weighted average risk-free interest rate |  |  | 1.30 | % |  |  | 1.11 | % |  |  | 2.07 | %
Weighted average expected volatility |  |  | 92.31 | % |  |  | 79.89 | % |  |  | 74.64 | %
Expected volatility |  |  | 86.16-97.21 | % |  |  | 77.37-84.81 | % |  |  | 73.88% - 79.11 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Weighted average expected option term (in years) |  |  | 5.66 |  |  |  | 6.17 |  |  |  | 6.00 |
Weighted average grant date fair value |  | $ | 0.81 |  |  | $ | 2.59 |  |  | $ | 3.79 |
Compensation expense recognized granted to employees | Compensation expense recognized relating to stock options granted to employees (in millions):
|  | 2013 |  |  | 2012 |  |  | 2011 |
Selling, general and administrative |  | $ | 0.2 |  |  | $ | 1.7 |  |  | $ | 2.2 |
Research and development |  |  | 0.0 |  |  |  | 1.1 |  |  |  | 1.4 |
Total |  | $ | 0.2 |  |  | $ | 2.8 |  |  | $ | 3.6 |
Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Compensation expense recognized granted to employees | Compensation expense recognized relating to restricted stock granted to employees (in millions):
|  | 2013 |  |  | 2012 |  |  | 2011 |
Selling, general and administrative |  | $ | 0.2 |  |  | $ | 0.7 |  |  | $ | 0.5 |
Research and development |  |  | 0.0 |  |  |  | 0.3 |  |  |  | 0.1 |
Total |  | $ | 0.2 |  |  | $ | 1.0 |  |  | $ | 0.6 |
Warrant [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Assumptions used to determine the fair value of stock options | The fair value of the Warrants at December 31, 2013 was determined by using an option pricing model assuming the following:
|  | 2013 Warrants |  |  | 2012 Warrants |  |  | 2009 Warrants |
Expected volatility |  |  | 90.75 | % |  |  | 106.77 | % |  |  | 128.50 | %
Risk-free interest rates |  |  | 1.63 | % |  |  | 0.26 | % |  |  | 0.10 | %
Expected life (in years) |  |  | 4.83 |  |  |  | 1.41 |  |  |  | 0.45 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + 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)(2) -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 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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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number D-98 -Paragraph 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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