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REVENUE RECOGNITION AND CONTRACT WITH CUSTOMERS - Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Liabilities |  |  |
Deferred revenue |  | $ 0 |
Equity |  |  |
Accumulated deficit | $ (324,298) | (306,813) | $ (306,813)
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |
Liabilities |  |  |
Deferred revenue |  |  | 2,474
Equity |  |  |
Accumulated deficit |  |  | $ (309,287)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Equity |  |  |
Accumulated deficit |  | 2,474 |
Transferred over Time | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Liabilities |  |  |
Deferred revenue |  | $ (2,474) |

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