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Property and Equipment, Net (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Property, Plant and Equipment [Abstract]        
Depreciation and amortization expense $ 723,000 $ 605,000 $ 2,759,000 $ 1,820,000