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Geographic And Segment Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Geographic and Segment information        
Number of reportable segments | segment     1  
Revenues | $ $ 0 $ 0 $ 0 $ 0