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Revenue (Tables)
12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue Total revenue based on the disaggregation criteria described above are as follows (in thousands):
    
Year ended
December 31,
 
    
2021
    
2020
 
Revenue by primary geographical market:
     
United States
   $ 2,215    $ 330
Germany
     536      25
Other European countries
     111      110
Asia
     145      1,114
  
 
 
    
 
 
 
Total
   $ 3,007    $ 1,579
  
 
 
    
 
 
 
Revenue by timing of recognition:
     
Recognized at a point in time
   $ 2,991    $ 1,515
Recognized over time
     16      64
  
 
 
    
 
 
 
Total
   $ 3,007    $ 1,579
  
 
 
    
 
 
 
Schedule of Contract Liabilities
Contract liabilities consisted of the following as of December 31, 2021 (in thousands):
 
    
As of
December 31, 2021
 
Contract liabilities, current
   $ 2,287
Contract liabilities, noncurrent
     631
  
 
 
 
Total
   $ 2,918
  
 
 
 
The following table shows the significant changes in contract liabilities balance as of December 31, 2021 and 2020 (in thousands):
 
    
Year ended
December 31,
 
    
2021
    
2020
 
Beginning balance
   $ 660    $ 950
Revenue recognized that was included in the contract liabilities beginning balance
     (570      (450
Increase due to invoices issued on performance obligations not yet satisfied during the period
     2,828      160
  
 
 
    
 
 
 
Ending balance
   $ 2,918    $ 660