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Property and equipment, net (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Abstract]    
Property and equipment, net
Property and equipment, net consisted of the following (in thousands):
 
 
  
June 30,
 
  
December 31,
 
 
  
2022
 
  
2021
 
Quantum computer systems
    $ 13,425      $ 13,425  
Lab equipment
      6,681        6,645  
Computer equipment
      3,352        3,305  
Leasehold improvements
      1,075        1,074  
Furniture and fixtures
      318        316  
Construction-in-progress
      374        285  
    
 
 
     
 
 
  
Total property and equipment
      25,225        25,050  
Less: Accumulated depreciation
      (22,453 )       (21,801 ) 
    
 
 
     
 
 
  
Property and equipment, net
    $ 2,772      $ 3,249  
    
 
 
     
 
 
  
Property and equipment, net consisted of the following (in thousands):
 
    
December 31,
  
    
2021
     
2020
  
Quantum computer systems
    $ 13,425      $ 12,103  
Lab equipment
      6,645        6,315  
Computer equipment
      3,305        2,954  
Leasehold improvements
      1,074        1,072  
Furniture and fixtures
      316        316  
Construction-in-progress
      285        502  
    
 
 
     
 
 
  
Total property and equipment
      25,050        23,262  
Less: Accumulated depreciation
      (21,801 )       (20,368 ) 
    
 
 
     
 
 
  
Property and equipment, net
    $ 3,249      $ 2,894