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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
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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

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- Definition Significant Consolidated Balance Sheet Components + References No definition available. + Details
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