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Related-Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Rent and facility related fees      
Related-Party Transactions      
Fees received from related party $ 0 $ 0 $ 400
Research and development expenses      
Related-Party Transactions      
Fees paid to related party $ 0 $ 0 $ 800