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The Company and Summary of Significant Accounting Policies Nonmarketable securities (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Payments to Acquire Investments   $ 600,000      
Preferred Stock [Member]          
Investments         $ 2,500,000
Other than Temporary Impairment Losses, Investments $ 0   $ 0    
Convertible Debt Securities [Member]          
Investments     $ 600,000 $ 600,000