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Property and Equipment and Capitalized Software - Summary of Composition of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 3,107 $ 3,314
Less: Accumulated depreciation (2,279) (2,207)
Property and equipment, net 828 1,107
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 487 487
Computer Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,255 1,218
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 423 423
Rental Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 519 763
Property and equipment, net $ 300 $ 500