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Property and Equipment, Net
 3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
Property and Equipment, net
Property and equipment, net, consisted of the following:

March 31,
2017
 
December 31, 2016
 
(In thousands)
Equipment
$
10,652

 
$
10,492

Furniture and fixtures
378

 
378

Computer software
10,719

 
10,431

Construction in progress
20

 
303

Leasehold improvements
542

 
536


22,311

 
22,140

Less: Accumulated depreciation and amortization
(20,109
)
 
(19,655
)
Property and equipment, net
$
2,202

 
$
2,485


For the three months ended March 31, 2017 and the three months ended March 31, 2016, depreciation expense was approximately $0.5 million and $0.7 million, respectively.
During the three months ended March 31, 2017, the Company retired less than $0.1 million gross property and equipment related to continuing operations. During the three months ended March 31, 2016, the Company did not retire any gross property and equipment related to continuing operations.