Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Debt Securities, Available-for-Sale - Additional Information (Detail)

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Investments in Marketable Debt Securities, Available-for-Sale - Additional Information (Detail)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Allowance for credit losses $ 0  
Weighted average contractual maturity 1 year 6 months 1 year 7 months 6 days
Fitch, AA Rating [Member] | Moody's, Aaa Rating [Member] | Standard & Poor's, AA Rating [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Weighted average contractual maturity 1 year 6 months  
Fitch, AA+ Rating [Member] | Moody's, Aa3 Rating [Member] | Standard & Poor's, AA+ Rating [Member] | Weighted Average Credit AA Plus Rating [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale, securities number of unrealized loss positions 98  
Available-for-sale, securities in unrealized loss positions, accumulated loss $ 511,000  
Percentage of amortized cost 0.20%