Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details)

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Property and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Equipment and Impairment of Long-Lived Assets      
Property and equipment $ 7,638 $ 7,025  
Less: Accumulated depreciation (3,700) (2,175)  
Total property and equipment, net 3,938 4,850  
Depreciation 1,527 1,273 $ 602
Construction in progress      
Property, Equipment and Impairment of Long-Lived Assets      
Property and equipment   18  
Depreciation 0    
Laboratory equipment      
Property, Equipment and Impairment of Long-Lived Assets      
Property and equipment $ 3,978 3,612  
Estimated useful life 5 years    
Assets recorded under capital leases $ 400    
Assets recorded under capital leases, accumulated depreciation 200    
Computer equipment      
Property, Equipment and Impairment of Long-Lived Assets      
Property and equipment $ 651 401  
Estimated useful life 3 years    
Furniture and fixtures      
Property, Equipment and Impairment of Long-Lived Assets      
Property and equipment $ 396 395  
Estimated useful life 4 years    
Leasehold improvements      
Property, Equipment and Impairment of Long-Lived Assets      
Property and equipment $ 2,613 $ 2,599  
Leasehold improvements | Maximum      
Property, Equipment and Impairment of Long-Lived Assets      
Estimated useful life 7 years