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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Accumulated deficit $ 752,332 $ 701,216
Cash and cash equivalents, and investment securities 78,300  
Restricted cash pledge 1,300 1,300
Prepaid research and development $ 7,737 $ 8,105