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Inventories
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventories
(3)
Inventories
Inventories consist of the following (in thousands):
 
 
  
March 31,
2022
 
  
December 31,
2021
 
Raw materials
   $ 841      $ 767  
Work-in-process
     881        645  
Finished goods
     289        —    
    
 
 
    
 
 
 
Total inventories
   $ 2,011      $ 1,412