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Property and Equipment and Capitalized Software - Summary of Composition of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 3,318 $ 3,190
Less: Accumulated depreciation (1,975) (1,831)
Property and equipment, net 1,343 1,359
Laboratory Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 150 150
Office Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 493 487
Computer Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 937 680
Manufacturing Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 273 273
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 172 153
Rental Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 1,293 $ 1,447