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Balance Sheet Details (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Balance Sheet Details        
Depreciation $ 0.2 $ 0.2 $ 0.7 $ 0.6
Construction in progress and fixed assets $ 9.3 $ 1.0 $ 9.3 $ 1.0