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Investments in Marketable Securities - Amortized Cost and Fair Value of Investments in Available for Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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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 | $ 23,760 | $ 47,823
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (1,046) | (21)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value | 0 | 566
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss | 0 | (1)
Available for sale securities continuous unrealized loss position, fair value | 23,760 | 48,389
Available for sale securities continuous unrealized loss position, gross unrealized loss | (1,046) | (22)
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 |  | 39,823
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 |  | 39,823
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 |  | 0
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss |  | 0
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value |  | 566
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss |  | (1)
Available for sale securities continuous unrealized loss position, fair value |  | 566
Available for sale securities continuous unrealized loss position, gross unrealized loss |  | (1)
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 | 17,553 | 6,029
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (756) | (3)
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 | 17,553 | 6,029
Available for sale securities continuous unrealized loss position, gross unrealized loss | (756) | (3)
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 | 6,207 | 1,971
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss | (290) | (13)
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 | 6,207 | 1,971
Available for sale securities continuous unrealized loss position, gross unrealized loss | $ (290) | $ (13)

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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=118939692&loc=d3e27337-111563 + Details
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