Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

12. Earnings/(loss) per share (Details - Dilutive securities)

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12. Earnings/(loss) per share (Details - Dilutive securities) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earningsloss Per Share      
Warrants to purchase common stock 6,733,292 6,733,292 6,733,292
Convertible promissory notes issued to underwriters and other related parties subject to possible conversion 99,243 99,243 99,243
Convertible promissory notes issued to shareholders subject to possible conversion 6,669,201 2,833,344 1,744,603
Options to purchase common stock 473,195 473,944 374,650
Total potential dilutive securities 13,974,931 10,139,823 8,951,788