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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Stockholders Equity Note [Abstract] |
Stock option activity | Stock option activity for 2015, 2014, and 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 |  |  | 299,242 |  |  | $19.68 - 248.64 |  | $ | 76.66 |  |  |  | 6.88 |
Granted |  |  | 130,328 |  |  | 4.80 - 34.08 |  |  | 17.41 |  |  |  |  |
Forfeited |  |  | (160,538 | ) |  | 19.68 - 29.92 |  |  | 24.47 |  |  |  |  |
Expired |  |  | (16,874 | ) |  | 6.08 - 197.44 |  |  | 63.50 |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 252,158 |  |  | $4.80 - 248.64 |  | $ | 57.90 |  |  |  | 7.36 |
Granted |  |  | 165,000 |  |  | 1.24 - 2.42 |  |  | 1.78 |  |  |  |  |
Forfeited |  |  | (89,757 | ) |  | 4.80 - 248.64 |  |  | 67.58 |  |  |  |  |
Expired |  |  | (45,666 | ) |  | 4.80 - 110.40 |  |  | 47.54 |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 281,735 |  |  | $1.24 - $245.12 |  | $ | 23.63 |  |  |  | 8.83 |
Granted |  |  | 524,250 |  |  | 1.19 |  |  | 1.19 |  |  |  |  |
Forfeited |  |  | (49,934 | ) |  | 1.19 - 169.60 |  |  | 30.01 |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 756,051 |  |  | $1.24 - $245.12 |  | $ | 7.65 |  |  |  | 8.95 |
Exercisable at December 31, 2015 |  |  | 188,249 |  |  | $1.24 - $245.12 |  | $ | 26.45 |  |  |  | 7.67 |
Assumptions used to determine estimated fair value of stock options granted | 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, 2015, 2014 and 2013:
|  | Year ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Weighted average risk-free interest rates |  |  | 1.82 | % |  |  | 1.53 | % |  |  | 1.30 | %
Weighted average expected volatility |  |  | 97.70 | % |  |  | 96.68 | % |  |  | 92.31 | %
Expected volatility |  |  | 97.70 | % |  | 95.47% - 98.14% |  |  | 86.16% - 97.21% |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |
Weighted average expected option term (in years) |  |  | 5.15 |  |  |  | 4.50 |  |  |  | 5.66 |
Weighted average grant date fair value |  | $ | 0.89 |  |  | $ | 1.78 |  |  | $ | 17.41 |
Summary of non-vested options | A summary of the Company’s non-vested options to purchase shares as of December 31, 2015 and changes during the year ended December 31, 2015 and December 31, 2014 are presented below:
|  | Non-Vested Options |
|  | Number of Options |  |  | Weighted Average Exercise Price |
Non-vested at January 1, 2014 |  |  | 118,610 |  |  | $ | 20.76 |
Granted |  |  | 165,000 |  |  |  | 1.78 |
Vested |  |  | (46,737 | ) |  |  | 26.35 |
Forfeited |  |  | (10,772 | ) |  |  | 35.92 |
Non-vested at December 31, 2014 |  |  | 226,101 |  |  | $ | 5.03 |
Granted |  |  | 524,250 |  |  |  | 1.19 |
Vested |  |  | (159,901 | ) |  |  | 5.36 |
Forfeited |  |  | (22,648 | ) |  |  | 4.38 |
Non-vested at December 31, 2015 |  |  | 567,802 |  |  | $ | 1.42 |
Summary of restricted stock activity | A summary of the Company’s restricted stock activity as of December 31, 2015 and changes during the year ended December 31, 2015 and December 31, 2014 are presented below:
|  | Restricted Stock Activity |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Non-vested at January 1, 2014 |  |  | 20,347 |  |  | $ | 16.84 |
Granted |  |  | 62,504 |  |  |  | 2.60 |
Vested |  |  | (18,815 | ) |  |  | 13.60 |
Forfeited |  |  | (34,237 | ) |  |  | 3.40 |
Non-vested at December 31, 2014 |  |  | 29,799 |  |  | $ | 4.46 |
Granted |  |  | 576,000 |  |  |  | 1.19 |
Vested |  |  | (29,666 | ) |  |  | 4.38 |
Forfeited |  |  | (133 | ) |  |  | 21.58 |
Non-vested at December 31, 2015 |  |  | 576,000 |  |  | $ | 1.19 |
Summary of 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 January 1, 2013 |  |  | 352,664 |  |  | $ | 19.20 |  |  | $ | 19.20 |  |  |  | 2.24 |
Issued |  |  | 589,500 |  |  |  |  |  |  |  | 7.04 |  |  |  |  |
Exercised |  |  | (12,669 | ) |  |  |  |  |  |  | 19.20 |  |  |  |  |
Expired |  |  | — |  |  |  |  |  |  |  | — |  |  |  |  |
Outstanding at December 31, 2013 |  |  | 929,495 |  |  | $2.56 – 7.04 |  |  | $ | 5.40 |  |  |  | 3.51 |
Issued |  |  | — |  |  |  |  |  |  |  | — |  |  |  |  |
Exercised |  |  | (49,139 | ) |  |  |  |  |  |  | 2.56 |  |  |  |  |
Expired |  |  | (30,218 | ) |  |  |  |  |  |  | 2.56 |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 850,138 |  |  | $1.75 – 7.04 |  |  | $ | 5.42 |  |  |  | 2.78 |
Issued |  |  | 17,469,500 |  |  |  |  |  |  |  | 0.80 |  |  |  |  |
Exercised |  |  | (215,318 | ) |  |  |  |  |  |  | 0.82 |  |  |  |  |
Expired |  |  | (45,320 | ) |  |  |  |  |  |  | 0.82 |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 18,059,000 |  |  | $0.74 – 7.04 |  |  | $ | 1.00 |  |  |  | 2.16 |

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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=26873400&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=51659978&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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