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Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Total property and equipment $ 579 $ 406
Less: accumulated depreciation and amortization (142) (85)
Property and equipment, net 437 321
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Total property and equipment   65
Machinery and Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 38 38
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Total property and equipment 397 194
Computers    
Property Plant And Equipment [Line Items]    
Total property and equipment 111 76
Office Equipment    
Property Plant And Equipment [Line Items]    
Total property and equipment 11 11
Software    
Property Plant And Equipment [Line Items]    
Total property and equipment $ 22 $ 22