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Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Proceeds from investment $ 611,000  
Carrying value of investment 0  
Fair Value Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liability measured and recognized at fair value 0 $ 0
Fair Value Measurements, Non-recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liability measured and recognized at fair value 0 0
Fair Value Measurements, Non-recurring | Fair Value, Level 3    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Privately-held investments measured at fair value $ 348,000 $ 348,000