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Organization and Summary of Significant Accounting Policies - Derivative Financial Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]      
Cash margin balances $ 2,700,000 $ 1,000,000.0  
Gain (loss) on derivative, net (3,000,000.0) (68,000) $ 117,000
Derivative, notional amount 20,400,000 $ 40,300,000 $ 29,900,000
Derivative, fair value, net $ 0    
Term of warrant 10 years