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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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