Stock based compensation, options and warrants (Schedule of Restricted Stock Activity) (Details) - Restricted Stock [Member] |
9 Months Ended |
|---|---|
|
Sep. 30, 2019
$ / shares
shares
| |
| Number of shares | |
| Unvested at January 1, 2019 | shares | 95,939 |
| Vested | shares | (50,522) |
| Granted | shares | 48,500 |
| Forfeited | shares | (55,000) |
| Unvested at September 30, 2019 | shares | 38,917 |
| Weighted Average Grant Date Fair value | |
| Unvested at January 1, 2019 | $ / shares | $ 12.49 |
| Vested | $ / shares | 8.23 |
| Granted | $ / shares | 3.78 |
| Forfeited | $ / shares | 14.95 |
| Unvested at September 30, 2019 | $ / shares | $ 3.68 |
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. No definition available.
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| X | ||||||||||
- 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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of non-vested options outstanding. No definition available.
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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| X | ||||||||||
- Definition Number of non-vested options forfeited. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of non-vested options forfeited. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of non-vested options outstanding. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Number of options vested. No definition available.
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| X | ||||||||||
- Definition Weighted average grant-date fair value of options vested. No definition available.
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| X | ||||||||||
- Details
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