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INCOME TAXES (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Deferred tax assets: |  |
Net operating loss carryforwards | $ 28,419 | $ 21,392
Depreciation and amortization | 36 |
Research Credits | 3,070 | 2,400
Deferred tax assets before valuation allowance | 31,525 | 23,792
Valuation allowance | (31,525) | (23,788)
Deferred tax assets net of valuation allowance |  | 4
Deferred tax liabilities: |  |
Depreciation and amortization |  | (4)
Total deferred tax liabilities |  | 4
Valuation allowance |  |
Deferred tax asset valuation allowance increase | $ 7,737 | $ 5,081

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