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Organization and Summary of Significant Accounting Policies - Research and Development Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Outside contracted services	$ 730,190	$ 365,689	$ 1,974,176	$ 1,316,581
Contracted services - related party	101,849	288,175	827,632	1,021,573
Personnel related costs	95,269	87,307	312,321	277,856
Facilities, overhead and other	15,884	23,637	65,456	60,279
Research and development expense, related party, net	$ 943,192	$ 764,808	$ 3,179,585	$ 2,676,289