Share-Based Compensation (Details 2) - $ / shares	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of stock options exercised	1,000	15,000	16,967	191,074
Weighted average exercise price	$ 1.75	$ 4.20	$ 4.51	$ 3.58

Number of share options (or share units) exercised during the current period.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration