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Organization and Summary of Significant Accounting Policies (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Maximum service period term (in years) 1 year  
Long-term Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 0 $ 0