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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Current Available-for-Sale Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Available-for-sale Marketable Securities |  |
Amortized Cost | $ 49,924 | $ 19,993
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (12) | 0
Fair Value | 49,912 | 19,993
Treasury discount notes |  |
Schedule of Available-for-sale Marketable Securities |  |
Amortized Cost | 49,924 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (12) |
Fair Value | $ 49,912 |
Commercial paper |  |
Schedule of Available-for-sale Marketable Securities |  |
Amortized Cost |  | 19,993
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | $ 19,993

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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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