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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Summary of Property and Equipment Property and equipment, summarized by major category, consist of the following as of December 31:
20212020
Machinery & equipment$4,848 $4,683 
Right of use, building and lease520 471 
Computer equipment & software640 272 
Office furniture & equipment174 174 
Leasehold improvements43 43 
Idle equipment679 679 
Construction in progress— 119 
Total6,904 6,441 
Less accumulated depreciation(5,163)(5,023)
Total property, plant & equipment, net$1,741 $1,418