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Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Equity component:    
Warrants [1] $ 318 $ 318
Conversion feature [1] 122 122
Net carrying amount [1] 440 440
Secured convertible notes    
Liability component:    
Principal 1,920 2,640
Less: debt discount and issuance costs, net of amortization (188) (385)
Net carrying amount 1,732 2,255
Equity component:    
Current portion of liability component included under short-term debt 1,920 720
Long-term portion of liability component included under long-term debt 0 1,920
Liability component total $ 1,920 $ 2,640
[1] Recorded on the consolidated balance sheets as additional paid-in capital.