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Property and Equipment	9 Months Ended
Property and Equipment	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment	5. Property and Equipment Depreciation and amortization expense on property and equipment for the three months ended September 30, 2017 and 2016 was $542 and $359, respectively. Depreciation and amortization expense on property and equipment for the nine months ended September 30, 2017 and 2016 was $1,396 and $889, respectively.