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FINANCIAL INSTRUMENTS (Details 3) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) customer | Dec. 31, 2016 USD ($) customer
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) | 34.00% | 36.00%
Accounts receivable | Credit risk | Major customer two |  |
Credit Risk |  |
Concentration risk (as a percent) | 29.00% | 29.00%
Accounts receivable | Credit risk | Major customer three |  |
Credit Risk |  |
Concentration risk (as a percent) | 27.00% | 25.00%

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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