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Marketable Securities - Fair Value of Available for Sale Marketable Securities (Detail) - Level 2 [Member] - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities, Adjusted Cost | $ 38,716 | $ 34,520
Available for sale securities, Unrealized Gains | 12 |
Available for sale securities, Unrealized Losses | (4) | (23)
Available for sale securities, Fair Value | 38,724 | 34,497
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities, Adjusted Cost | 34,905 | 31,521
Available for sale securities, Unrealized Gains | 11 |
Available for sale securities, Unrealized Losses | (4) | (23)
Available for sale securities, Fair Value | 34,912 | 31,498
Government-Sponsored Enterprises Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale securities, Adjusted Cost | 3,811 | 2,999
Available for sale securities, Unrealized Gains | 1 |
Available for sale securities, Fair Value | $ 3,812 | $ 2,999

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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