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Marketable Securities (Details 3) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale |  |
Less than one year, fair value | $ 182,702 | $ 264,934
Gross Unrealized Loss |  |
Less than one year, gross unrealized loss | (300) | (64)
US Government bonds and notes |  |
Debt Securities, Available-for-sale |  |
Less than one year, fair value | 0 | 14,112
Gross Unrealized Loss |  |
Less than one year, gross unrealized loss | 0 | (1)
Corporate notes, bonds and commercial paper and other |  |
Debt Securities, Available-for-sale |  |
Less than one year, fair value | 182,702 | 250,822
Gross Unrealized Loss |  |
Less than one year, gross unrealized loss | $ (300) | $ (63)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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