Fair Value Measurements - Additional Information (Detail) - Discount for Lack of Marketability |
Sep. 30, 2020 |
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Minimum | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Equity securities measurement input | 0.160 |
Maximum | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Equity securities measurement input | 0.315 |
Weighted Average | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
Equity securities measurement input | 0.268 |