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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 1,499   $ 1,255
Less: Accumulated depreciation (353)   (270)
Property and equipment, net 1,146   985
Depreciation expense 83 $ 28  
Laboratory Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross 1,042   1,042
Computer Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross 106   98
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, Gross $ 351   $ 115