Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net (Details)

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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment at cost $ 7,652 $ 6,913
Accumulated depreciation (3,207) (2,879)
Property and equipment, net 4,445 4,034
Laboratory equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 6,656 6,101
Office and computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment at cost 670 494
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment at cost $ 326 $ 318