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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Notes Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Notes payable outstanding $ 1,600 $ 800
Current notes payable 702 815
Notes payable, long-term portion $ 883 $ 0