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4. Property and Equipment, net
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Property and Equipment, net

5. Property and Equipment, net

 

Property and equipment, net consists of the following:

   March 31,
2019		   December 31,
2018		 
Office and computer equipment  $42,288   $42,289 
Leasehold improvements   –    26,841 
Furniture and fixtures   14,738    20,263 
Property and equipment – at cost   57,026    89,393 
Less accumulated depreciation   (53,528)   (84,437)
Property and equipment – net  $3,498   $4,956 

 

Depreciation expense was approximately $1,000 and $6,000 for the three months ended March 31, 2019 and 2018, respectively.
4. Property and Equipment, net

 

Property and equipment, net consists of the following:

 

   December 31,
2018		   December 31,
2017		 
Laboratory equipment  $–   $264,583 
Office and computer equipment   42,289    46,634 
Leasehold improvements   26,841    26,841 
Furniture and fixtures   20,263    20,263 
Property and equipment – at cost   89,393    358,321 
Less accumulated depreciation   (84,437)   (330,475)
Property and equipment – net  $4,956   $27,846 

 

Depreciation expense was approximately $16,000 and $24,000 for the years ended December 31, 2018 and 2017, respectively. During the year ended December 31, 2018, the Company sold certain laboratory equipment for $22,500 resulting in an approximate $15,000 gain.