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Investments in Marketable Securities - Amortized Cost and Fair Value of Investments in Available for Sale Securities Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities continuous unrealized loss position for less than 12 months, fair value | $ 20,949 | $ 72,058
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (55) | (45)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 484 | 157
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | (14) | (5)
Available for sale securities continuous unrealized loss position, fair value | 21,433 | 72,215
Available for sale securities continuous unrealized loss position, gross unrealized loss | (69) | (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 |  | 41,702
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss |  | (5)
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 |  | 41,702
Available for sale securities continuous unrealized loss position, gross unrealized loss |  | (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 | 139 |
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 | 139 |
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 | 20,447 | 29,810
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (52) | (34)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 139 | 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 | 20,586 | 29,810
Available for sale securities continuous unrealized loss position, gross unrealized loss | (60) | (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 | 363 | 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 | 345 | 157
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | (6) | (5)
Available for sale securities continuous unrealized loss position, fair value | 708 | 703
Available for sale securities continuous unrealized loss position, gross unrealized loss | $ (6) | $ (11)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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