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REVENUE RECOGNITION AND CONTRACT WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accumulated deficit | $ (310,486) | $ (306,813) | $ (306,813)
Deferred revenue |  | 0 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Accumulated deficit |  | 2,474 |
Transferred over Time | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue |  | $ 2,474 |

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