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Organization and Summary of Significant Accounting Policies - Prepaid Expenses and Other Current Assets (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Prepaid expenses - various $ 81,320 $ 91,725
Prepaid insurance 254,997 77,249
Prepaid taxes 551 3,027
Prepaid expenses and other current assets $ 336,868 $ 172,001