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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 377 $ 398
Accumulated depreciation and amortization (367) (374)
Property and equipment, net $ 10 24
Computer Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 54 65
Lab Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 5 years  
Property and Equipment, Gross $ 142 142
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Estimated Life 5 years  
Property and Equipment, Gross $ 61 62
Computer Software    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 61 70
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Estimated Life Lesser of useful life or life of the lease  
Property and Equipment, Gross $ 59 $ 59