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Significant Consolidated Balance Sheet Components - Prepaid Expense and Other Current Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Significant Consolidated Balance Sheet Components [Abstract]    
Prepaid expenses $ 10.4 $ 12.0
Contract assets 5.8 3.0
Certificate of deposit 2.0 2.0
Other current assets 0.1 0.4
Total prepaid expenses and other current assets $ 18.3 $ 17.4