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Stock based compensation, options and warrants (Schedule of Restricted Stock Activity) (Details) - Restricted Stock [Member]	3 Months Ended
	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

X

- 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

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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

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- Definition

Number of non-vested options outstanding.

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- Definition

Number of non-vested options forfeited.

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- Definition

Weighted average grant-date fair value of non-vested options forfeited.

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Number of increase (decrease) of non-vested options.

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Weighted average grant-date fair value of options vested.

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