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Fair Value of Financial Instruments - Fair Value Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets    
Marketable equity securities $ 1,339 $ 202
Liabilities    
RMB Warrants 4
Level 1    
Assets    
Marketable equity securities 1,339 202
Vendetta Warrants
Liabilities    
Kinross calls
RMB Warrants
Level 2    
Assets    
Marketable equity securities
Vendetta Warrants 735
Liabilities    
Kinross calls 2
RMB Warrants 4
Level 3    
Assets    
Marketable equity securities
Vendetta Warrants
Liabilities    
Kinross calls
RMB Warrants