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Property and Equipment - Summary of Property and Equipment (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Property Plant And Equipment [Line Items]    
Property and Equipment, Gross $ 265 $ 271
Accumulated depreciation and amortization (217) (250)
Property and equipment, net $ 48 21
Computer Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 50 31
Lab Equipment    
Property Plant And Equipment [Line Items]    
Estimated Life 5 years  
Property and Equipment, Gross $ 133 146
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Estimated Life 5 years  
Property and Equipment, Gross $ 43 38
Computer Software    
Property Plant And Equipment [Line Items]    
Estimated Life 3 years  
Property and Equipment, Gross $ 39 $ 56