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Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents        
Cash and cash equivalents $ 5,834 $ 9,559    
Total cash and cash equivalents $ 5,834 $ 9,559 $ 7,433 $ 468