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Segment Reporting - Revenue by geographic location (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting        
Revenue $ 6,829 $ 8,164 $ 25,726 $ 29,934
Inside the United States        
Segment Reporting        
Revenue 3,836 5,144 17,184 20,448
Outside the United States        
Segment Reporting        
Revenue $ 2,993 $ 3,020 $ 8,542 $ 9,486