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Note 9 - Acquired Intangible Assets, Net
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Goodwill and Intangible Assets Disclosure [Text Block]
9.
Acquired Intangible Assets, Net
 
Intangible assets consist of the following:
 
        December 31, 2018   December 31, 2017    
    Gross Value   Accumulated
Currency
Translation
Adjustment		   Accumulated
Amortization		   Net Book
Value		   Accumulated
Currency
Translation
Adjustment		   Accumulated
Amortization		   Net Book
Value		   Useful
Life
(in years)
Developed technology   $
17,100
     $
(2,824
 )   $
(8,672
 )   $
5,604
     $
(2,550
 )   $
(7,723
 )   $
6,827
      
15
  
In-process research & development    
4,406
      
(1,168
 )    
-
      
3,238
      
(1,015
 )    
 
      
3,391
      
Indefinite
  
Distributor relationships    
4,700
      
(415
 )    
(4,285
 )    
-
      
(415
 )    
(4,285
 )    
-
      
5
  
Patents    
1,000
      
(169
 )    
(482
 )    
349
      
(152
 )    
(431
 )    
417
      
16
  
Elevess trade name    
1,000
      
-
      
(1,000
 )    
-
      
-
      
(1,000
 )    
-
      
9
  
Total   $
28,206
     $
(4,576
 )   $
(14,439
 )   $
9,191
     $
(4,132
 )   $
(13,439
 )   $
10,635
      
 
  
 
The Company performed an annual assessment of IPR&D intangible assets as of
November 30, 2018. 
Based upon that assessment, for the fiscal year
2018
there were
no
events or changes in circumstances that would result in a change in the carrying value of IPR&D. 
 
Total amortization expense was
$1.0
million,
$1.0
million, and
$1.1
million for the years ended
December 
31,
2018,
2017,
and
2016,
respectively. Amortization expense on intangible assets is expected to be approximately
$1.0
million in
2019,
$1.0
million annually through
2022,
and approximately
$2.1
million in aggregate thereafter.