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8. Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2019
Property and equipment:  
Property and equipment
   December 31, 
   2019   2018 
Property and equipment  $134,202   $128,156 
Less: Accumulated depreciation and amortization   (127,803)   (126,931)
Total property and equipment, net  $6,399   $1,225