4. Property and Equipment, net |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Property, Plant and Equipment [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Property and Equipment, net |
Property and equipment, net consists of the following:
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. |
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