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REVENUE RECOGNITION AND CONTRACT WITH CUSTOMERS (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles |
| Balance at December 31, 2017 |  | New Revenue Standard Adjustment |  | Balance at January 1, 2018
Liabilities |  |  |  |  |
Deferred revenue | $ | 2,474 |  |  | $ | (2,474 | ) |  | $ | — |
Equity |  |  |  |  |
Accumulated deficit | $ | (309,287 | ) |  | $ | 2,474 |  |  | $ | (306,813 | )

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