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Organization and Summary of Significant Accounting Policies - Research and Development Costs (Details) - USD ($) | 12 Months Ended
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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

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