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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained deficit |  | $ (653,673) | $ (594,948)
Forecast Adjustment | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Minimum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained deficit | $ 1,100 |  |
Forecast Adjustment | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Maximum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained deficit | $ 1,200 |  |

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