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Property and Equipment
 9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
2.
Property and Equipment
 
Property and equipment are stated at cost less accumulated depreciation and amortization (in thousands), and consist of the following:
 
 
 
September 30,
 
 
December 31,
 
 
 
2018
 
 
2017
 
Equipment
 
$
13,478
 
 
$
13,574
 
Software
 
 
8,605
 
 
 
7,291
 
Furniture and equipment
 
 
2,257
 
 
 
2,276
 
Leasehold improvements
 
 
5,331
 
 
 
5,342
 
Total
 
 
29,671
 
 
 
28,483
 
Less: accumulated depreciation and amortization
 
 
(22,591
)
 
 
(21,294
)
 
 
$
7,080
 
 
$
7,189
 
 
Depreciation and amortization expense of property and equipment was approximately $0.5 million and $0.6 million for the three months ended September 30, 2018 and 2017, respectively. Depreciation and amortization expense of property and equipment was approximately $1.7 million and $1.9 million for the nine months ended September 30, 2018 and 2017, respectively.