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Summary of Significant Accounting Policies - Preferred Stock Discount (Details) - Private Placement - Series X redeemable convertible preferred stock - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Feb. 28, 2021
Jun. 30, 2023
Preferred stock discount    
Beneficial conversion feature $ 19.6  
Issuance costs $ 5.7  
Non-cash dividend   $ 24.4
Value of remaining shares not yet converted   $ 0.9