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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Affiliated Entity        
Related Party Transaction [Line Items]        
Research and development expense $ 281 $ 242 $ 810 $ 745