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Organization and Summary of Significant Accounting Policies (Details 3) - shares
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Common shares equivalents, outstanding 24,381,679 19,436,262 18,817,702 21,134
Convertible notes [Member]        
Common shares equivalents, outstanding 1,845,703    
Convertible preferred stock [Member]        
Common shares equivalents, outstanding 16,660,275 17,929,825 16,616,250
Warrants [Member]        
Common shares equivalents, outstanding 3,653,443 470,939 470,939 15,174
Options [Member]        
Common shares equivalents, outstanding 1,355,758 540,905 873,420 5,960
Stock awards [Member]        
Common shares equivalents, outstanding 866,500 494,593 857,093