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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 432 $ 443
Accumulated depreciation and amortization (403) (401)
Property and equipment, net $ 29 42
Computer Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 65 74
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 $ 83 83
Computer Software    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 83 85
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