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Stock options and warrants (Schedule of Nonvested Awards) (Details) (USD $)
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9 Months Ended |
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Sep. 30, 2013
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Stock Incentive Plan [Member]
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| Nonvested Shares Underlying Options | |
| Beginning balance | 508,435 |
| Granted | 525,603 |
| Vested | (314,193) |
| Forfeited | (7,308) |
| Ending balance | 712,537 |
| Weighted Average Exercise Price | |
| Beginning balance | $ 3.70 |
| Granted | $ 2.06 |
| Vested | 4.06 |
| Forfeited | $ 2.46 |
| Ending balance | $ 2.35 |
| Weighted Average Grant Date Fair Value | |
| Beginning balance | $ 3.07 |
| Granted | $ 1.75 |
| Vested | $ 3.36 |
| Forfeited | $ 2.07 |
| Ending balance | $ 1.98 |
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Nonqualified [Member]
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| Nonvested Shares Underlying Options | |
| Beginning balance | 8,333 |
| Granted | |
| Vested | (8,333) |
| Forfeited | |
| Ending balance | |
| Weighted Average Exercise Price | |
| Beginning balance | $ 3.42 |
| Granted | |
| Vested | 3.42 |
| Forfeited | |
| Ending balance | |
| Weighted Average Grant Date Fair Value | |
| Beginning balance | $ 2.84 |
| Granted | |
| Vested | $ 2.84 |
| Forfeited | |
| Ending balance |
| X | ||||||||||
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- Definition
Number of nonvested shares granted during the period. No definition available.
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| X | ||||||||||
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- Definition
Weighted average exercise price of nonvested options granted during the period. No definition available.
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| X | ||||||||||
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- Definition
Weighted average grant date fair value of nonvested options granted during the period. No definition available.
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| X | ||||||||||
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- Definition
Weighted average exercise price of nonvested options forfeited during th period. No definition available.
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| 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
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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