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Organization and Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Employee wages and benefits $ 258,616 $ 268,287
Research and development expenses 90,085 49,666
Other 47,340 81,623
Accrued expenses $ 396,041 $ 399,576