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Derivative Instruments (Tables)
12 Months Ended
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gain (loss) on derivative instruments
(in thousands)  

Year ended

December 31,

 
     2020      2019  
  (Loss) Gain on Kinross calls – realized   $ (121 )   $ 9  
  Gain (loss) on Vendetta Warrants – unrealized     29       (47 )
    $ (92 )   $ (38 )