Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Investments in Marketable Securities - Amortized Cost and Fair Value of Investments in Available for Sale Securities Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 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 $ 62,150 $ 72,058
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (40) (45)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 368 157
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (5) (5)
Available for sale securities continuous unrealized loss position, fair value 62,518 72,215
Available for sale securities continuous unrealized loss position, gross unrealized loss (45) (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 36,576 41,702
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (22) (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 36,576 41,702
Available for sale securities continuous unrealized loss position, gross unrealized loss (22) (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 134  
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (2)  
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 134  
Available for sale securities continuous unrealized loss position, gross unrealized loss (2)  
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 25,190 29,810
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (16) (34)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 145 0
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (3) 0
Available for sale securities continuous unrealized loss position, fair value 25,335 29,810
Available for sale securities continuous unrealized loss position, gross unrealized loss (19) (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 250 546
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss 0 (6)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 223 157
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (2) (5)
Available for sale securities continuous unrealized loss position, fair value 473 703
Available for sale securities continuous unrealized loss position, gross unrealized loss $ (2) $ (11)