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INCOME TAXES (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Asset: |  |
Net operating loss carryforward | $ 60,276 | $ 51,449
Research and development credit carryforwards | 918 | 918
Other | 116 | 585
Deferred Tax Assets, Gross | 61,310 | 52,952
Less valuation allowance | (61,310) | (52,902)
Deferred Tax Asset | 0 | 50
Deferred Tax Liability: |  |
Property and equipment | 0 | 50
Deferred Tax Liability | 0 | 50
Net Deferred Asset (Liability) | $ 0 | $ 0

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