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Organization and Summary of Significant Accounting Policies - Research and Development Costs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Outside contracted services $ 1,637,953 $ 1,299,072
Contracted services - related party 1,215,536 437,621
Personnel related costs 376,312 362,060
Facilities, overhead and other 87,363 104,342
Research and development expense, related party, net $ 3,317,164 $ 2,203,095