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Fixed Assets - Major Classes of Fixed Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Fixed assets, gross $ 12,332 $ 11,039
Less: Accumulated depreciation (5,886) (3,767)
Fixed assets, net 6,446 7,272
Computer Hardware    
Property Plant And Equipment [Line Items]    
Fixed assets, gross $ 1,579 1,435
Useful life in years 3 years  
Computer Software    
Property Plant And Equipment [Line Items]    
Fixed assets, gross $ 495 463
Useful life in years 3 years  
Medical Lab Equipment    
Property Plant And Equipment [Line Items]    
Fixed assets, gross $ 8,136 7,145
Useful life in years 5 years  
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Fixed assets, gross $ 233 159
Useful life in years 5 years  
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Fixed assets, gross $ 802 763
Useful life in years Shorter of lease term or estimated useful life  
Assets Not Yet Placed in Service    
Property Plant And Equipment [Line Items]    
Fixed assets, gross $ 1,087 $ 1,074