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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