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Fair Value Measurements - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cost method investments $ 9,900,000 $ 9,900,000   $ 8,900,000
Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Amount invested into non-marketable convertible note     $ 1,000,000.0  
Changes in fair value $ 0 $ 0