Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Debt Securities, Available-for-Sale - Amortized Cost and Fair Value of Investments in Available for Sale Securities Unrealized Loss Position (Detail)

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Investments in Marketable Debt Securities, Available-for-Sale - Amortized Cost and Fair Value of Investments in Available for Sale Securities Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value $ 221,957 $ 72,058
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (503) (45)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 146 157
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (8) (5)
Available for sale securities continuous unrealized loss position, fair value 222,103 72,215
Available for sale securities continuous unrealized loss position, gross unrealized loss (511) (50)
U.S. Treasuries [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 103,019 41,702
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (297) (5)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 0 0
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss 0 0
Available for sale securities continuous unrealized loss position, fair value 103,019 41,702
Available for sale securities continuous unrealized loss position, gross unrealized loss (297) (5)
U.S. Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 115  
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (3)  
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 0  
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss 0  
Available for sale securities continuous unrealized loss position, fair value 115  
Available for sale securities continuous unrealized loss position, gross unrealized loss (3)  
Corporate debt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 115,908 29,810
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (173) (34)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 146 0
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (8) 0
Available for sale securities continuous unrealized loss position, fair value 116,054 29,810
Available for sale securities continuous unrealized loss position, gross unrealized loss (181) (34)
ABS and other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 2,915 546
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (30) (6)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 0 157
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss 0 (5)
Available for sale securities continuous unrealized loss position, fair value 2,915 703
Available for sale securities continuous unrealized loss position, gross unrealized loss $ (30) $ (11)