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Investments - Additional Information (Details)
Dec. 31, 2021
USD ($)
Position
Dec. 31, 2020
USD ($)
Investments Debt And Equity Securities [Abstract]    
Number of available-for-sale securities in unrealized loss positions for less than twelve months | Position 7  
Available-for-sale securities in unrealized loss positions for less than twelve months $ 15,800,000  
Available-for-sale securities in unrealized loss positions   $ 0