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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Thousands
 2 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Net income (loss)       $ 476,923 $ 130,695 $ (27,460)
Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Amount invested in non-marketable convertible note $ 2,000 $ 2,000 $ 1,000 2,000    
Unrealized gains     $ 200      
Level 3 | Matterport, Inc.            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Unrealized gains $ 72,910          
Level 3 | Matterport, Inc. | Equity Securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets recognized at fair value       $ 77,500    
Level 3 | Matterport, Inc. | Equity Securities | Market Approach Valuation Technique            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Net income (loss)   4,100        
Level 3 | Matterport, Inc. | Equity Securities | Other Income            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Net income (loss)   68,800        
Level 3 | Matterport, Inc. | Equity Securities | Gain on Investments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Net income (loss)   $ 72,900        
Level 3 | Matterport, Inc. | Common Stock | Equity Securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Number of shares issued 4,316,301 4,316,301   4,316,301