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Organization and Summary of Significant Accounting Policies - Property and Equipment (Details)
12 Months Ended
Dec. 31, 2018
Furniture and fixtures | Minimum  
Property and Equipment  
Estimated useful life 5 years
Furniture and fixtures | Maximum  
Property and Equipment  
Estimated useful life 7 years
Software and computer equipment | Minimum  
Property and Equipment  
Estimated useful life 3 years
Software and computer equipment | Maximum  
Property and Equipment  
Estimated useful life 5 years