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Derivative Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Gain (loss) on derivative instruments | $ (92) | $ (38)
Kinross Calls - Realized |  |
Gain (loss) on derivative instruments | (121) | 9
Vendetta Warrants - Unrealized |  |
Gain (loss) on derivative instruments | $ 29 | $ (47)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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