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Note 2 - Revenue
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Revenue from Contract with Customer [Text Block]
2.
Revenue
 
On
January 1, 2018,
we adopted FASB ASC Topic
606,
Revenue from Contracts with Customers,
or ASC Topic
606,
under the modified retrospective approach using the practical expedient in paragraph
606
-
10
-
10
-
4.
The
five
step model defined by ASC Topic
606
requires us to (
1
) identify our contracts with customers, (
2
) identify our performance obligations under those contracts, (
3
) determine the transaction prices of those contracts, (
4
) allocate the transaction prices to our performance obligations in those contracts and (
5
) recognize revenue when each performance obligation under those contracts is satisfied. Revenue is recognized when promised goods or services are transferred to the customer in an amount that reflects the consideration expected in exchange for those goods or services. Our adoption of ASC Topic
606
did
not
result in an adjustment to our accumulated deficit and did
not
have a material impact on the amount and timing of our revenue recognition for the year ended
December 31, 2018.
 
The Company’s prior year revenues have been recast to present the U.S. Laboratory Services Business as a discontinued operation. For further information on these changes, refer to Note
19.
Discontinued operations.
 
The following tables present the Company’s revenues disaggregated by type:
 
   
Year ended December 31,
  
(in thousands)
  
2018
    
2017
    
2016
  
Revenue
  
 
 
 
  
 
 
 
  
 
 
 
Product
   $
54,687
     $
48,899
     $
43,070
  
Service
    
5,066
      
5,834
      
3,918
  
Total revenue
   $
59,753
     $
54,733
     $
46,988
  
 
The following tables reflect revenue by geography (United States, Europe and rest of world, or Europe and ROW, and Asia):
 
   
Year ended December 31,
  
(in thousands, except percentages)
  
2018
    
2017
    
2016
  
Revenue
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
United States
   $
16,442
      
28
%
   $
15,720
      
29
%
   $
10,372
      
22
%
Europe and ROW
    
9,153
      
15
%
    
8,136
      
15
%
    
6,988
      
15
%
Asia
    
34,158
      
57
%
    
30,877
      
56
%
    
29,628
      
63
%
Total revenue
   $
59,753
      
100
%
   $
54,733
      
100
%
   $
46,988
      
100
%