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FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 1,107
Time Deposits	1,460
Short-term Investments	25,601
Warrant liabilities (Note 13)	(6,283)
Convertible debentures (Note 12)	(15,880)
Financial instruments fair value	6,005
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,107	$ 903
Time Deposits	1,460
Short-term Investments	0
Warrant liabilities (Note 13)	(5,621)
Convertible debentures (Note 12)	(15,880)
Financial instruments fair value	(18,934)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0
Time Deposits	0
Short-term Investments	25,601
Warrant liabilities (Note 13)	0
Convertible debentures (Note 12)	0
Financial instruments fair value	25,601
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 (Note 13)	(662)	$ (385)
Convertible debentures (Note 12)	0
Financial instruments fair value	$ (662)

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Fair value of asset after deduction of liability.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Amount of time deposit liabilities, including certificates of deposit.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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