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Condensed Financial Information of Registrant - Condensed Balance Sheets - Additional Information (Details) - Parent Company - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]    
Common stock, par value (dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares, outstanding 58,000,000 59,000,000
Preferred stock, par value (dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0