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Organization and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Accumulated amortization $ 0 $ 0
Intangible assets, net $ 17,630,000 0
Marketing-related intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 15 years  
Sublicense agreement    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 11,330,000 0
Trademark license    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 6,030,000 0
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 270,000 $ 0
Minimum | Contract-based intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 11 years 1 month 6 days  
Maximum | Contract-based intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life 15 years