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FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments at fair value | $ 366 |
Time deposits | 419 |
Short-term Investments | 2,013 |
Marketable debt securities | (1,468) | $ (2,791)
Convertible Debentures | (14,557) |
Financial instruments fair value | (13,227) |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments at fair value | 366 |
Time deposits | 419 |
Short-term Investments | 0 |
Marketable debt securities | (1,468) |
Convertible Debentures | (14,557) |
Financial instruments fair value | (15,240) |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments at fair value | 0 |
Time deposits | 0 |
Short-term Investments | 2,013 |
Marketable debt securities | 0 |
Convertible Debentures | 0 |
Financial instruments fair value | 2,013 |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments at fair value | 0 |
Time deposits | 0 |
Short-term Investments | 0 |
Marketable debt securities | 0 |
Convertible Debentures | 0 |
Financial instruments fair value | $ 0 |

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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