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Derivative Instruments - Gain on Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain on Kinross calls		$ 24
Gain on Vendetta Warrants		148
Gain on derivative instruments		$ 172

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