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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 | 6 Months Ended | |||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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| Stock options and warrants [Abstract] | |||||
| Shares issued for warrants exercised | 1,161,570 | ||||
| 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] | |||||
| Stock-based compensation expense | 326,392 | 411,126 | 729,413 | 895,347 | |
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Nonqualified [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||
| Awards outstanding | 3,455,935 | 3,455,935 | 4,622,505 | ||
| Stock-based compensation expense | 8,000 | 22,000 | |||
| Fair value of options vested | 0 | 24,000 | |||
| Unrecognized compensation expense | $ 0 | $ 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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- 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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- Details
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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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- Details
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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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- 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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- 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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- 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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