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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Accumulated deficit $ (474,485) $ (354,863)
Restricted cash and investments 1,200 600
Prepaid research and development $ 11,389 $ 8,056