Annual report pursuant to Section 13 and 15(d)

Property and Equipment, net (Details Textual)

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Property and Equipment, net (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Depreciation, Depletion and Amortization $ 1,732 $ 1,855 $ 933