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Supplementary Balance Sheet Information - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Gross property and equipment $ 32,964   $ 32,896
Depreciation $ 471 $ 471  
Building And Construction      
Property, Plant and Equipment [Line Items]      
Standard warranty period 12 months    
EBGL      
Property, Plant and Equipment [Line Items]      
Standard warranty period 25 years    
Land and Building      
Property, Plant and Equipment [Line Items]      
Gross property and equipment $ 2,000