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Property and equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
2.
Property and equipment
 
Property and equipment, which include amounts recorded under capital leases, are stated at cost less accumulated depreciation and amortization (in thousands), and consist of the following:
 
 
 
December 31,
 
 
 
2018
 
 
2017
 
Equipment
 
$
13,165
 
 
$
13,574
 
Software
 
 
8,868
 
 
 
7,291
 
Furniture and equipment
 
 
2,153
 
 
 
2,276
 
Leasehold improvements
 
 
4,604
 
 
 
5,342
 
Total
 
 
28,790
 
 
 
28,483
 
Less: accumulated depreciation and amortization
 
 
(21,977
)
 
 
(21,294
)
 
 
$
6,813
 
 
$
7,189
 
 
Depreciation and amortization expense of property and equipment was approximately $2.2 million and $2.5 million for the years ended December 31, 2018 and 2017, respectively.
 
Total assets financed under capital leases for the years ended December 31, 2018 and 2017 were $0.2 million and $0.8 million, respectively.