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RESTRUCTURING - (Details) - USD ($) | 12 Months Ended | 22 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016
Restructuring |  |
Restructuring charges | $ 1,306,000 |
Cash payments after adjustments and non-cash credits |  | $ 988,000
One-time termination benefits |  |
Restructuring |  |
Restructuring charges | 1,306,000 |
Non-cash stock-based compensation expense | $ 307,000 |

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