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ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Provision) benefit for income taxes |  | $ (20) | $ 157 | $ (28) | $ (26) | $ (23) | $ (23) | $ (23) | $ 129 | $ (46) | $ 109 | $ (69) | $ (262) | $ 101 | $ (95) |
Deferred tax asset, current |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  | $ 0 |  | $ 0 |  |  |  | $ 2,300
Deferred tax assets, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,300
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Provision) benefit for income taxes | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  | $ 67 |  |

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