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Revenue (Tables)
 3 Months Ended
Mar. 31, 2022
Revenue [Abstract]  
Disaggregation of Revenue The disaggregation of revenue is based on geographical region. All revenue is recognized at the point in time when control is transferred to our clients. The following tables present revenue from contracts with customers for the three months ended March 31, 2022 and 2021 (in thousands):

 
  
Three Months Ended March 31, 2022
   
Three Months Ended March 31, 2021
  
 
  
United States
    
International
    
Total
    
United States
    
International
    
Total
  
Accessories and parts
  
$
2,132
    
$
(4
)
  
$
2,128
    
$
1,435
    
$
136
    
$
1,571
  
Product
    
691
      
16
      
707
      
41
      
212
      
253
  
License fees and other
    
8
      
9
      
17
      
33
      
5
      
38
  
Topic 606 Revenue
  
$
2,831
    
$
21
    
$
2,852
    
$
1,509
    
$
353
    
$
1,862
  
 
                                                
Rental income
    
343
      
-
      
343
      
254
      
-
      
254
  
Topic 842 Revenue
  
$
343
    
$
-
    
$
343
    
$
254
    
$
-
    
$
254
  
 
                                                
Total Revenue
  
$
3,174
    
$
21
    
$
3,195
    
$
1,763
    
$
353
    
$
2,116
  
Contract Liabilities
The following table summarizes the changes in contract liabilities during the three months ended March 31, 2022 (in thousands):

 
  
Three Months ended
March 31, 2022
    
Three Months ended
March 31, 2021
  
Beginning balance
  
$
341
    
$
69
  
New service agreement additions
    
28
      
1
  
Deposit on future equipment purchases
    
-
      
125
  
Revenue recognized
    
(8
)
    
(8
)
Total contract liabilities
    
361
      
187
  
Less current portion
    
(58
)
    
(32
)
Non-current contract liabilities
  
$
303
    
$
155