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3. Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
Allowance For Doubtful Accounts Tables  
Schedule of Allowance for Doubtful Accounts
    Years Ended December 31,  
    2015     2014  
             
Balance, beginning of year   $ 49     $ 84  
Provision for doubtful accounts     —       35  
Uncollectible accounts written off     —       (70 )
Balance, end of year   $ 49     $ 49