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16. SUBSEQUENT EVENTS (Tables)
12 Months Ended
Dec. 31, 2019
Subsequent Events [Abstract]  
Minimum quarterly royalties payable

Year ending December 31,   
 2021:   $2,050,000 
 2022:   $2,300,000 
 2023:   $2,550,000 
 2024:   $2,800,000 
 2025:   $2,800,000