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Financial Instruments and Risk Management - Liquidity risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Instruments and Risk Management        
Cash and cash equivalents $ 5,834 $ 9,559 $ 7,433 $ 468
Equity $ 7,038 $ 9,362 $ (931) $ 2,550