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Investments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Schedule of Investments [Line Items]          
Available-for-sale debt securities, allowance for credit losses $ 0 $ 0 $ 0 $ 0  
Purchase an available-for-sale debt securities with credit deterioration     0    
Carrying value of investment 1,000,000.0   1,000,000.0   $ 1,000,000.0
Asset impairments 0 $ 0 0 0 400,000
Cumulative asset impairment charges 2,400,000   2,400,000    
Unsecured loan converted to equity investment         500,000
Secured Loans Receivable [Member]          
Schedule of Investments [Line Items]          
Asset impairments     0 $ 0 500,000
Long-term Investments [Member]          
Schedule of Investments [Line Items]          
Secured note receivable, noncurrent $ 400,000   $ 400,000   $ 400,000
Investment [Member] | Issuer Concentration [Member] | Market Value of Total Investment Portfolio [Member]          
Schedule of Investments [Line Items]          
Investment concentration risk percentage     5.00%