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FINANCIAL INSTRUMENTS - Concentration of credit risk (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Percentage of entity's revenue	86.30%
Concentration risk, percentage	26.10%	32.00%	28.90%
United States of America
Disclosure of detailed information about financial instruments [line items]
Percentage of entity's revenue	73.30%
One Customer
Disclosure of detailed information about financial instruments [line items]
Percentage of entity's revenue	11.20%	11.30%	10.20%

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- Definition

Concentration Risk, Percentage

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

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- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2019-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_34&doctype=Standard
-URIDate 2019-03-27

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