Note 6 - Stockholders' Equity | 6 Months Ended |
Jun. 30, 2014 |
Stockholders' Equity Note [Abstract] | ' |
Stockholders' Equity Note Disclosure [Text Block] | ' |
6. Stockholders’ Equity |
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Preferred Stock Transactions |
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During the six months ended June 30, 2014, we issued an aggregate of 202,857 and 1,200,000 shares of our common stock related to conversions of our Series A and Series B Convertible Preferred Stock, respectively. As of June 30, 2014, there are no shares of our Series A Convertible Preferred Stock outstanding, and 1,230 shares of our Series B Convertible Preferred Stock outstanding, convertible into 3,514,286 shares of our common stock. |
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Common Stock Transactions |
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Other than common stock issued pursuant to the conversion of our Series A and Series B Convertible Preferred Stock described above, we issued no shares of our common stock during the six months ended June 30, 2014. |
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Stock Options |
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We maintain a stock option plan that provides the Board of Directors broad discretion in creating equity incentives for employees, officers, directors and consultants. The following table presents a summary of stock option transactions during the six months ended June 30, 2014: |
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| | Number of Shares | | | Weighted Average | |
Exercise Price |
Outstanding at December 31, 2013 | | | 1,197,044 | | | $ | 3.79 | |
Granted | | | 7,500 | | | | 0.29 | |
Exercised | | | -- | | | | -- | |
Forfeited or expired | | | (223,245 | ) | | | 1.91 | |
Outstanding at June 30, 2014 | | | 981,299 | | | $ | 4.19 | |
Exercisable at June 30, 2014 | | | 624,793 | | | $ | 6.23 | |
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Stock Purchase Warrants |
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We have previously issued stock purchase warrants in connection with financing transactions and also in exchange for services from consultants and others. As of June 30, 2014, there are 8,284,826 stock purchase warrants outstanding, with a weighted average exercise price of $2.07. |
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Stock-Based Compensation Expense |
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During the three month and six month periods ended June 30, 2014, we recorded share-based compensation expense related to stock options of $25,047 and $51,354, as compared to $35,978 and $83,252 for the three month and six month periods ended June 30, 2013, respectively. Share-based compensation expense is recognized on a straight-line basis over the requisite service period for the award and is allocated to research and development expense or general and administrative expense based upon the related employee classification. As of June 30, 2014, there was $131,512 of unrecognized compensation expense related to stock options, which is expected to be recognized over a weighted average period of 1.8 years. |
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During the three and six month periods ended June 30, 2014 and 2013, we recorded no expense related to the issuance of stock purchase warrants in exchange for services; and as of June 30, 2014, there was no unrecognized compensation expense related to any compensatory warrant arrangements. During the three month and six month periods ended June 30, 2013, we recorded $19,617 and $238,168 of general and administrative expense associated with certain modifications to then-outstanding stock purchase warrants. |
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Common Stock Reserved |
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A summary of our common stock reserved for future issuance is as follows as of June 30, 2014: |
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Series B Convertible Preferred Stock | | | 3,514,286 | | | | | |
Common Stock Purchase Warrants | | | 8,284,826 | | | | | |
Equity Incentive Plans | | | 1,197,529 | | | | | |
Total | | | 12,996,641 | | | | | |
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