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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Affiliated Entity        
Related Party Transaction [Line Items]        
Research and development expense $ 253 $ 258 $ 529 $ 503