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7. Property and Equipment (Tables)
3 Months Ended
Mar. 31, 2019
Property and equipment:  
Property and equipment

Property and equipment at March 31, 2019 and December 31, 2018, consisted of the following:

 

    March 31,     December 31,  
    2019     2018  
Property and equipment   $ 128,965     $ 128,156  
Less: Accumulated depreciation and amortization     (127,374 )     (126,931 )
Total property and equipment, net   $ 1,591     $ 1,225