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3. ASC Topic 606, Revenue from Contracts with Customers (Tables)
12 Months Ended
Dec. 31, 2018
Asc Topic 606Revenue From Contracts With Customers Tables Abstract  
Revenue

    Twelve months Ended  
    December 31  
    2018     2017  
Product sales revenue   $ 5,636,839     $ 6,103,741  
Royalty revenue     201,000       201,000  
Total Revenue   $ 5,837,839     $ 6,304,741