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Organization and Summary of Significant Accounting Policies - Accrued Expenses (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Employee wages and benefits $ 166,168 $ 268,287
Research and development expenses 60,251 49,666
Other 76,551 81,623
Accrued expenses $ 302,970 $ 399,576