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Fair Value Measurements - Additional Information (Detail) - Discount for Lack of Marketability
Mar. 31, 2021
Minimum  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Equity securities measurement input 0.120
Maximum  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Equity securities measurement input 0.150
Weighted Average  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Equity securities measurement input 0.133