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Property and Equipment
 12 Months Ended
Dec. 31, 2016
Property Plant And Equipment [Abstract]  
Property and Equipment

4. Property and Equipment

Property and equipment consist of the following (in thousands):

 

 

 

December 31,

 

 

 

2016

 

 

2015

 

Furniture and fixtures

 

$

324

 

 

$

324

 

Computer and office equipment

 

 

318

 

 

 

300

 

Software

 

 

103

 

 

 

103

 

Leasehold improvements—building

 

 

180

 

 

 

180

 

Scientific equipment

 

 

4,858

 

 

 

4,725

 

Property and equipment, gross

 

 

5,783

 

 

 

5,632

 

Less accumulated depreciation and amortization

 

 

(4,204

)

 

 

(3,472

)

Property and equipment, net

 

$

1,579

 

 

$

2,160

 

 

Depreciation expense related to property and equipment was $0.9 million, $0.7 million, and $0.5 million, for the years ended December 31, 2016, 2015, and 2014, respectively. No material gains or losses on the disposal of property and equipment have been recorded for the years ended December 31, 2016, 2015, and 2014.