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Long-Term Debt (Schedule of carrying value of Notes and Warrants) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Liability component:    
Principal $ 3,000 $ 3,000
Less: debt discount and issuance costs, net of amortization (680) (778)
Net carrying amount 2,320 2,222
Equity component(1):    
Warrants [1] 318 318
Conversion feature [1] 122 122
Net carrying amount [1] $ 440 $ 440
[1] Recorded on the condensed consolidated balance sheets as additional paid-in capital.