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3. Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2018
Allowance For Doubtful Accounts  
Schedule of Allowance for Doubtful Accounts
    Years Ended December 31,  
    2018     2017  
Balance, beginning of year   $ 50     $ 50  
Provision for doubtful accounts     —       —  
Uncollectible accounts written off     —       —  
Balance, end of year   $ 50     $ 50