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Long-Term Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Liability component:    
Principal $ 2,820  
Equity component:    
Warrants [1] 318 $ 318
Conversion feature [1] 122 122
Net carrying amount [1] 440 440
Secured convertible notes    
Liability component:    
Principal 2,820 3,000
Less: debt discount and issuance costs, net of amortization (483) (581)
Net carrying amount 2,337 2,419
Equity component:    
Current portion of liability component included under short-term debt 540 360
Long-term portion of liability component included under long-term debt 1,797 2,059
Liability component total $ 2,337 $ 2,419
[1] Recorded on the condensed consolidated balance sheets as additional paid-in capital.