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Property and Equipment	9 Months Ended
Property and Equipment	Sep. 30, 2018
Property and Equipment.
Property and Equipment	7. Property and Equipment Depreciation expense on property and equipment for the three months ended September 30, 2018 and 2017 was $851 and $542, respectively. Depreciation expense on property and equipment for the nine months ended September 30, 2018 and 2017 was $2,566 and $1,396, respectively.