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Derivative Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Gain (loss) on derivative instruments $ (38) $ 0
Kinross Calls - Realized    
Gain (loss) on derivative instruments 9 0
Vendetta Warrants - Unrealized    
Gain (loss) on derivative instruments $ (47) $ 0