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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | 8. Stock-Based Compensation The Company’s Stock Incentive Plan provides for the issuance of long-term incentive awards, or awards, in the form of non-qualified and incentive stock options, or Options, stock appreciation rights, stock grants and restricted stock units. The awards may be granted by the Company’s Board of Directors to its employees, directors and officers and to consultants, agents, advisors and independent contractors who provide services to the Company. The exercise price for Options must not be less than the fair market value of the underlying shares on the date of grant. Options expire no later than ten years from the date of grant and generally vest and become exercisable over a four-year period following the date of grant. Every non-employee member of the Company’s Board of Directors receives an annual non-qualified Option or restricted stock unit grant. Upon the exercise of Options, the Company issues the resulting shares from shares reserved for issuance under the Company’s Incentive Plan. Stock-based compensation expense is reduced by an estimated forfeiture rate derived from historical employee termination behavior. If the actual number of forfeitures differs from the Company’s estimates, the Company may record adjustments to increase or decrease compensation expense in future periods. The estimated grant-date fair value of the Company’s stock-based awards is amortized ratably over the awards’ service periods. Stock-based compensation expense recognized was as follows:
|  | Three Months Ended March 31, |
|  | 2015 |  | 2014 |
|  | (Unaudited) |  | (Unaudited) |
Research and development expense |  | $ | 29,000 |  | $ | 38,000 |
General and administrative expense |  |  | 23,000 |  |  | 196,000 |
Total stock-based compensation expense |  | $ | 52,000 |  | $ | 234,000 |
The following table summarizes stock option activity for the three months ended March 31, 2015:
|  |  |  |  | Options Outstanding |
|  | Shares |  |  |  | Weighted Average |  | Average Remaining |  |  |
|  | Available for |  |  |  | Exercise |  | Contractual Term |  | Intrinsic |
|  | Grant |  | Shares |  | Price |  | (Years) |  | Value |
Balance, December 31, 2014 |  |  | 39,250,000 |  |  | 22,034,747 |  | $ | 0.19 |  |  | 8.18 |  | $ | 640,837 |
Granted |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Forfeited |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Expired |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Balance, March 31, 2015 |  |  | 39,250,000 |  |  | 22,034,747 |  | $ | 0.19 |  |  | 7.93 |  | $ | 2,561,000 |
Vested or expected to vest at March 31, 2015 |  |  |  |  |  | 21,890,939 |  | $ | 0.19 |  |  | 7.92 |  | $ | 2,547,000 |
Exercisable at March 31, 2015 |  |  |  |  |  | 19,995,058 |  | $ | 0.18 |  |  | 7.92 |  | $ | 2,396,000 |
The intrinsic value of options exercisable as of March 31, 2015 was $2.4 million, based on the Company’s closing stock price of $0.30 per share and a weighted average exercise price of $0.18 per share. The Company uses the Black-Scholes option-pricing model to estimate the fair value of stock options at the grant date. The Black-Scholes model requires the Company to make certain estimates and assumptions, including estimating the fair value of the Company’s common stock, assumptions related to the expected price volatility of the Company’s stock, the period during which the options will be outstanding, the rate of return on risk-free investments and the expected dividend yield for the Company’s stock. There were no grants of stock options to employees or directors during the three months ended March 31, 2015 and 2014. As of March 31, 2015, there was $0.4 million of total unrecognized compensation expense related to unvested options that will be recognized over the weighted average remaining period of 1.91 years. Shares Reserved For Further Issuance As of March 31, 2015, the Company had reserved shares of its common stock for future issuance as follows:
|  | Shares Reserved |
Stock options outstanding |  |  | 22,034,747 |
Available for future grants under the Stock Incentive Plan |  |  | 39,250,000 |
Warrants |  |  | 63,314,696 |
Total Shares reserved |  |  | 124,599,443 |

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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