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MARKETABLE SECURITIES - Gross unrealized gains (losses) on marketable securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable Securities: |  |
Gross unrealized Gains | $ 0 | $ 3
Gross unrealized (Losses) | 0 | (12)
Municipal Obligations |  |
Marketable Securities: |  |
Gross unrealized Gains | 0 | 2
Gross unrealized (Losses) | 0 | (2)
Corporate Obligations |  |
Marketable Securities: |  |
Gross unrealized Gains | 0 | 1
Gross unrealized (Losses) | $ 0 | $ (10)

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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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