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FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | $ 721 |
Time deposits | 1,138 |
Short-term Investments | 10,296 |
Warrant liabilities | (5,412) | $ (5,621)
Convertible debentures | (17,055) |
Financial instruments fair value | (10,312) |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 721 |
Time deposits | 1,138 |
Short-term Investments | 0 |
Warrant liabilities | (5,412) |
Convertible debentures | (17,055) |
Financial instruments fair value | (20,608) |
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0 |
Time deposits | 0 |
Short-term Investments | 10,296 |
Warrant liabilities | 0 |
Convertible debentures | 0 |
Financial instruments fair value | 10,296 |
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0 |
Time deposits | 0 |
Short-term Investments | 0 |
Warrant liabilities | 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=99377789&loc=d3e19207-110258 + Details
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