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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2015
Stockholders' Equity [Abstract] |
Schedule of stock options outstanding and exercisable |
|  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |
|  |  |  |  | Average |  |  | Weighted |  |  |  |  |  | Weighted |
|  |  |  |  | Remaining |  |  | Average |  |  |  |  |  | Average |
Range of Exercise |  | Number |  |  | Contractual |  |  | Exercise |  |  | Options |  |  | Exercise |
Prices between |  | Outstanding |  |  | Life |  |  | Price |  |  | Exercisable |  |  | Price |
$0.32 - $0.65 |  |  | 3,443,680 |  |  |  | 9.37 |  |  | $ | 0.41 |  |  |  | 1,288,537 |  |  | $ | 0.49 |
$0.66 - $0.79 |  |  | 390,000 |  |  |  | 8.54 |  |  |  | 0.79 |  |  |  | 390,000 |  |  | $ | 0.79 |
$0.80 - $12.25 |  |  | 370,897 |  |  |  | 6.19 |  |  |  | 5.51 |  |  |  | 370,897 |  |  | $ | 5.51 |
|  |  | 4,204,577 |  |  |  | 9.01 |  |  | $ | 0.90
Summary of stock option activity |
Balance, December 31, 2014 |  |  | 5,613,977 |
Granted |  |  | 1,449,432 |
Forfeited or expired |  |  | (2,858,832 | )
Balance, June 30, 2015 |  |  | 4,204,577
Schedule of weighted average assumptions |
Risk-free interest rate |  | 1.69%
Expected term |  | 6.25 years
Expected price volatility |  | 95.13%
Dividend yield |  | -

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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 the change in stock options. + References No definition available. + Details
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- Definition Tabular disclosure of the number of fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both options (or share units) currently outstanding and options (or share units) exercisable (or convertible). + 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 (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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