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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2017
Property Plant And Equipment [Abstract]  
Property and Equipment, Net

5. Property and Equipment, Net

Property and equipment, net consisted of the following:

 

 

 

December 31,

 

 

 

2017

 

 

2016

 

Laboratory equipment

 

$

1,308

 

 

$

1,240

 

Leasehold improvements

 

 

559

 

 

 

559

 

Computer equipment and software

 

 

195

 

 

 

331

 

Furniture and fixtures

 

 

71

 

 

 

71

 

 

 

 

2,133

 

 

 

2,201

 

Less: Accumulated depreciation and amortization

 

 

(1,979

)

 

 

(2,094

)

 

 

$

154

 

 

$

107

 

 

Depreciation and amortization expense for the years ended December 31, 2017, 2016 and 2015 was $95, $232 and $325, respectively. During the year ended December 31, 2017, fully depreciated assets with a cost of $210 were disposed of for no proceeds, resulting in neither a gain nor a loss and during the year ended December 31, 2016, assets with a cost of $12 were disposed of for no proceeds, resulting in a loss of $12. No assets were disposed of during the year ended December 31, 2015.