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Significant Accounting Policies - Cash, Cash Equivalents, and Short-term Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Significant Accounting Policies    
Cash equivalents $ 61.5 $ 41.7
Cash and cash equivalents maintained outside the United States (as a percent) 18.00% 32.00%