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REVENUE RECOGNITION AND CONTRACTS WITH CUSTOMERS (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred Revenue |  | $ 0 |
Retained Earnings (Accumulated Deficit) | $ (332,058) | (306,813) | $ (309,287)
Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Revenue, Remaining Performance Obligation | $ 2,740 |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred Revenue |  |  | 2,474
Retained Earnings (Accumulated Deficit) |  |  | $ (309,287)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained Earnings (Accumulated Deficit) |  | 2,474 |
Transferred over Time [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred Revenue |  | $ (2,474) |

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