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Property and Equipment	6 Months Ended
Property and Equipment	Jun. 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 June 30, 2017 and 2016 was $439 and $307, respectively. Depreciation and amortization expense on property and equipment for the six months ended June 30, 2017 and 2016 was $854 and $530, respectively