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Stock options and warrants (Other common stock purchase options and warrants) (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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May 31, 2013
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Sep. 30, 2014
Nonqualified [Member]
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Sep. 30, 2013
Nonqualified [Member]
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Dec. 31, 2013
Nonqualified [Member]
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| Stock options and warrants [Abstract] | ||||||||
| Shares issued for warrants exercised | 1,161,570 | 4,025,000 | ||||||
| Warrants, number of shares per warrant | 0.35 | 0.35 | 0.35 | |||||
| Value of shares issued for warrants exercised | $ 1,580,000 | |||||||
| Exercise price of warrants | $ 1.36 | $ 1.36 | $ 1.36 | |||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||
| Awards outstanding | 3,455,935 | 4,622,505 | ||||||
| Stock-based compensation expense | 214,074 | 332,250 | 943,486 | 1,227,597 | 0 | 22,000 | ||
| Fair value of options vested | 0 | 24,000 | ||||||
| Unrecognized compensation expense | $ 0 | |||||||
| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Exercise price per share or per unit of warrants or rights outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares issued during the period as a result of the conversion of convertible securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross value of stock issued during the period upon the conversion of convertible securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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