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Derivative Instruments - Gain on Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain on Kinross calls		$ 55
Gain on Vendetta Warrants		216
Gain on Derivative Instruments		$ 271

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