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Property and Equipment
 9 Months Ended
Sep. 30, 2017
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,
 
 
 
2017
 
2016
 
Equipment
 
$
14,332
 
$
14,558
 
Software
 
 
6,911
 
 
5,685
 
Furniture and equipment
 
 
2,452
 
 
2,119
 
Leasehold improvements
 
 
5,342
 
 
4,929
 
Total
 
 
29,037
 
 
27,291
 
Less: accumulated depreciation and amortization
 
 
(21,715)
 
 
(21,894)
 
 
 
$
7,322
 
$
5,397
 
 
Depreciation and amortization expense of property and equipment was approximately $0.6 million and $0.5 million for the three months ended September 30, 2017 and 2016, respectively. Depreciation and amortization expense of property and equipment was approximately $1.9 million and $1.5 million for the nine months ended September 30, 2017 and 2016, respectively.