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Organization and Summary of Significant Accounting Policies - Prepaid Expenses and Other Current Assets (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Prepaid insurance $ 91,725 $ 89,760
Prepaid expenses - various 77,249 63,678
Prepaid taxes 3,027 1,170
Prepaid expenses and other current assets $ 172,001 $ 154,608