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Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Basis of Presentation                  
Cash and cash equivalents $ 40,387           $ 40,387   $ 65,221
Accumulated deficit (639,338)           (639,338)   $ (590,598)
Net Income (Loss) $ (13,650) $ (8,299) $ (26,791) $ (50,486) $ (53,515) $ (52,796) (48,740) $ (156,797)  
Net cash used in operating activities             $ (57,218) $ (128,143)