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Revenue (Tables)
 3 Months Ended
Mar. 31, 2021
Revenue [Abstract]  
Disaggregation of revenue
Disaggregation of revenue

The following table disaggregates our revenue by market-type, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors.  Sales and usage-based taxes are excluded from revenues.

 
Three Months Ended
  
 
March 31,
  
   
2021
    
2020
  
   
(In thousands)
  
   
United States
    
International
    
Total
    
United States
    
International
    
Total
  
Food service technology
  
$
2,564
    
$
183
    
$
2,747
    
$
1,239
    
$
132
    
$
1,371
  
POS automation
    
1,160
      
4
      
1,164
      
1,554
      
4
      
1,558
  
Casino and gaming
    
1,964
      
901
      
2,865
      
2,558
      
2,373
      
4,931
  
Printrex
    
27
      
132
      
159
      
61
      
56
      
117
  
Transact Services Group
    
1,280
      
86
      
1,366
      
2,003
      
267
      
2,270
  
 Total net sales
  
$
6,995
    
$
1,306
    
$
8,301
    
$
7,415
    
$
2,832
    
$
10,247
  
Net contract assets (liabilities)

 
March 31, 2021
    
December 31, 2020
  
   
(In thousands)
  
Unbilled receivables, current
  
$
293
    
$
290
  
Unbilled receivables, non-current
    
516
      
591
  
Customer pre-payments
    
(146
)
    
(216
)
Deferred revenue, current
    
(569
)
    
(504
)
Deferred revenue, non-current
    
(202
)
    
(111
)
Total net contract (liabilities) assets
  
$
(108
)
  
$
50