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Certain Balance Sheet Items Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid Insurance $ 385 $ 519
Deferred Cost - service contracts 56 154
Other 2 4
Other Assets, Noncurrent $ 443 $ 677