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9. PROMISSORY NOTES (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Summary of promissory notes
Unsecured promissory note balance - December 31, 2018   $ 11,862,080  
         
Accretion of discount and amortization of debt issuance costs     515,750  
         
Unsecured promissory note balance - December 31, 2019   $ 12,377,830