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Prepaid and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid and Other Current Assets
Prepaid and other current assets as of December 31, 2021 and 2020 were as follows (in thousands):
 
    
As of December 31,
 
    
2021
    
2020
 
Prepaid expenses
   $ 3,980    $ 549
Demonstration units
     224      —    
Other
     847      847
  
 
 
    
 
 
 
Total prepaid and other current assets
   $ 5,051    $ 1,396