The amount of resources: (a) controlled by the entity as a result of past events; and (b) from which future economic benefits are expected to flow to the entity.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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The amount of current investments.

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FINANCIAL INSTRUMENTS (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]
Short-term investments	$ 18,252
Long-term investments	60,630	$ 61,293	$ 26,580
Total assets	660,915	534,882
Recurring fair value measurement [member]
Disclosure of fair value measurement of assets [line items]
Total assets	78,882	61,293
Recurring fair value measurement [member] \| Level 1 of fair value hierarchy [member]
Disclosure of fair value measurement of assets [line items]
Total assets	43,974	28,850
Recurring fair value measurement [member] \| Level 2 of fair value hierarchy [member]
Disclosure of fair value measurement of assets [line items]
Total assets	34,908	32,443
Recurring fair value measurement [member] \| Covertible Debt [member]
Disclosure of fair value measurement of assets [line items]
Short-term investments	15,000
Long-term investments	16,595	29,039
Recurring fair value measurement [member] \| Covertible Debt [member] \| Level 2 of fair value hierarchy [member]
Disclosure of fair value measurement of assets [line items]
Short-term investments	15,000
Long-term investments	16,595	29,039
Recurring fair value measurement [member] \| Warrants [member]
Disclosure of fair value measurement of assets [line items]
Long-term investments	3,313	3,404
Recurring fair value measurement [member] \| Warrants [member] \| Level 2 of fair value hierarchy [member]
Disclosure of fair value measurement of assets [line items]
Long-term investments	3,313	3,404
Recurring fair value measurement [member] \| Common Shares Held [member]
Disclosure of fair value measurement of assets [line items]
Short-term investments	3,252
Long-term investments	40,722	28,850
Recurring fair value measurement [member] \| Common Shares Held [member] \| Level 1 of fair value hierarchy [member]
Disclosure of fair value measurement of assets [line items]
Short-term investments	3,252
Long-term investments	$ 40,722	$ 28,850