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Property and equipment
6 Months Ended
Jun. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
2.
Property and equipment
 
Property and equipment are stated at costs less accumulated depreciation and amortization (in thousands), and consist of the following:
 
 
 
June 30
 
December 31,
 
 
 
2014
 
2013
 
Equipment
 
$
17,639
 
$
17,327
 
Software
 
 
4,649
 
 
4,045
 
Furniture and equipment
 
 
2,656
 
 
2,600
 
Leasehold improvements
 
 
5,856
 
 
5,810
 
Total
 
 
30,800
 
 
29,782
 
Less: accumulated depreciation and amortization
 
 
(24,264)
 
 
(23,699)
 
 
 
$
6,536
 
$
6,083
 
 
Depreciation and amortization expense of property and equipment was approximately $1.4 million and $1.9 million for the six months ended June 30, 2014 and 2013, respectively.