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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) $ in Millions | Aug. 04, 2017 USD ($) | Sep. 07, 2012 lawsuit | Jun. 30, 2017 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |  |  |
Purchase obligation |  |  | $ 32.9
Shareholder Class Action |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits | lawsuit |  | 2 |
Subsequent event | Shareholder Class Action |  |  |
Loss Contingencies [Line Items] |  |  |
Litigation settlement, amount awarded to other party | $ (6.8) |  |

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