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Change in accounting principle, Effect of Change on Statements of Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Condensed Consolidated Statements of Comprehensive Loss [Abstract]          
Net loss $ (2,376) $ (4,348) $ (2,030) $ (6,724) $ (4,119)
Comprehensive loss $ (2,384) (4,390) (1,998) $ (6,774) (4,034)
Previously Reported [Member]          
Condensed Consolidated Statements of Comprehensive Loss [Abstract]          
Net loss   (4,013) (2,114)   (4,320)
Comprehensive loss   (4,055) (2,082)   (4,235)
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]          
Condensed Consolidated Statements of Comprehensive Loss [Abstract]          
Net loss   (335) 84   201
Comprehensive loss   $ (335) $ 84   $ 201