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FINANCIAL INSTRUMENTS (Details 3)	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) customer	Dec. 31, 2016 customer	Dec. 31, 2017 USD ($)
Credit Risk
Number of major customers | customer	3	3
Amount of allowance for doubtful accounts | $	$ 0		$ 0
Accounts receivable | Credit risk | Major customer one
Credit Risk
Concentration risk (as a percent)	31.00%	35.00%
Accounts receivable | Credit risk | Major customer two
Credit Risk
Concentration risk (as a percent)	28.00%	30.00%
Accounts receivable | Credit risk | Major customer three
Credit Risk
Concentration risk (as a percent)	24.00%	27.00%

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Represents the number of major customers of the reporting entity.

+ References

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

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