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Property and equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
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,
 
 
 
2017
 
2016
 
Equipment
 
$
13,574
 
$
14,558
 
Software
 
 
7,291
 
 
5,685
 
Furniture and equipment
 
 
2,276
 
 
2,119
 
Leasehold improvements
 
 
5,342
 
 
4,929
 
Total
 
 
28,483
 
 
27,291
 
Less: accumulated depreciation and amortization
 
 
(21,294)
 
 
(21,894)
 
 
 
$
7,189
 
$
5,397