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Derivative Instruments - Gain on Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
(Loss) gain on Kinross calls $ 14 $ (82) $ 38 $ (83)
Gain on Vendetta Warrants 99 215 247 215
Total $ 113 $ 133 $ 285 $ 132