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Fair Value - Fair Value Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets    
Marketable equity securities $ 188 $ 2,308
Liabilities    
RMB warrants 6 55
Level 1    
Assets    
Marketable equity securities $ 188 $ 2,308
Liabilities    
RMB warrants
Level 2    
Assets    
Marketable equity securities
Liabilities    
RMB warrants $ 6 $ 55
Level 3    
Assets    
Marketable equity securities
Liabilities    
RMB warrants