4. Property and Equipment, net |
6 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Jun. 30, 2018 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Property, Plant and Equipment [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Property and Equipment, net |
Property and equipment, net consists of the following:
Depreciation expense was approximately $5,000 and $6,000 for the three months ended June 30, 2018 and 2017, respectively, and approximately $11,000 and $14,000 for the six months ended June 30, 2018 and 2017, respectively. |