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Organization of the Company and Basis of Presentation (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Organization of the Company and Basis of Presentation [Abstract]    
Net loss $ (8,445) $ (7,830)
Accumulated deficit (366,072) (357,627)
Cash and cash equivalents $ 33,406 $ 11,885