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Stock options and warrants (Schedule of Nonvested Awards) (Details) (Stock Incentive Plan [Member], USD $)
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6 Months Ended | |
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Jun. 30, 2014
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Jun. 30, 2013
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Stock Incentive Plan [Member]
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| Nonvested Shares Underlying Options | ||
| Beginning balance | 200,446 | |
| Granted | 652,100 | |
| Vested | (187,356) | |
| Forfeited | (4,565) | (7,308) |
| Ending balance | 660,625 | |
| Weighted Average Exercise Price | ||
| Beginning balance | $ 2.95 | |
| Granted | $ 2.28 | |
| Vested | $ 2.62 | |
| Forfeited | $ 2.12 | |
| Ending balance | $ 2.38 | |
| Weighted Average Grant Date Fair Value | ||
| Beginning balance | $ 2.48 | |
| Granted | $ 1.91 | |
| Vested | $ 2.21 | |
| Forfeited | $ 1.77 | |
| Ending balance | $ 1.99 | |
| X | ||||||||||
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- Definition
Weighted average exercise price of nonvested options outstanding. No definition available.
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| X | ||||||||||
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- Definition
Weighted average exercise price of share-based payment awards that vested during the period. No definition available.
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| X | ||||||||||
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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| X | ||||||||||
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of non-vested options outstanding. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number of non-vested options forfeited. No definition available.
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| X | ||||||||||
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- Definition
Weighted average grant-date fair value of non-vested options forfeited. No definition available.
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| X | ||||||||||
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- Definition
Weighted average grant-date fair value of non-vested options outstanding. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Number of options vested. No definition available.
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| X | ||||||||||
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- Definition
Weighted average grant-date fair value of options vested. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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| X | ||||||||||
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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