Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net (Details Textual)

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Property and Equipment, Net (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Abstract]        
Depreciation expense of property and equipment $ 1.1 $ 0.9 $ 3.4 $ 2.9