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Fair Value of Financial Instruments - Fair Value Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets    
Marketable equity securities $ 202 $ 2,308
Liabilities    
RMB warrants 4 55
Fair Value, Inputs, Level 1 [Member]    
Assets    
Marketable equity securities $ 202 $ 2,308
Liabilities    
RMB warrants
Fair Value, Inputs, Level 2 [Member]    
Assets    
Marketable equity securities
Liabilities    
RMB warrants $ 4 $ 55
Fair Value, Inputs, Level 3 [Member]    
Assets    
Marketable equity securities
Liabilities    
RMB warrants