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Revenue (Tables)
 3 Months Ended
Mar. 31, 2022
Revenue [Abstract]  
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,
  
   
2022
    
2021
  
   
(In thousands)
  
   
United States
    
International
    
Total
    
United States
    
International
    
Total
  
Food service technology
  
$
1,946
    
$
184
    
$
2,130
    
$
2,564
    
$
183
    
$
2,747
  
POS automation
    
1,300
      
–
      
1,300
      
1,160
      
4
      
1,164
  
Casino and gaming
    
2,788
      
1,974
      
4,762
      
1,964
      
901
      
2,865
  
Printrex
    
–
      
–
      
–
      
27
      
132
      
159
  
Transact Services Group
    
1,068
      
442
      
1,510
      
1,280
      
86
      
1,366
  
 Total net sales
  
$
7,102
    
$
2,600
    
$
9,702
    
$
6,995
    
$
1,306
    
$
8,301
  
Net Contract (Liabilities) Assets Total net contract liabilities consisted of the following:

 
March 31, 2022
    
December 31, 2021
  
   
(In thousands)
  
Unbilled receivables, current
  
$
329
    
$
314
  
Unbilled receivables, non-current
    
253
      
308
  
Customer pre-payments
    
(253
)
    
(99
)
Deferred revenue, current
    
(823
)
    
(805
)
Deferred revenue, non-current
    
(171
)
    
(186
)
Total net contract liabilities
  
$
(665
)
  
$
(468
)