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Stock based compensation, options and warrants (Schedule of Restricted Stock Activity) (Details) - Restricted Stock [Member] | 3 Months Ended
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Mar. 31, 2018 $ / shares shares
Number of shares |
Beginning balance | shares | 496,152
Granted | shares | 292,500
Vested | shares | (30,913)
Forfeited | shares | (26,563)
Delivered | shares | (50,000)
Ending balance | shares | 681,176
Weighted Average Grant Date Fair value |
Beginning balance | $ / shares | $ 5.97
Granted | $ / shares | 13.08
Vested | $ / shares | 12.35
Forfeited | $ / shares | 10.58
Delivered | $ / shares | 4.50
Ending balance | $ / shares | $ 8.66

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- Definition Issued. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of increase (decrease) of non-vested options. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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