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Significant Accounting Policies, Investments and Inventory Valuation (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Company
Dec. 31, 2015
USD ($)
Cash, Cash Equivalents, and Short-term Investments [Abstract]    
Number of publicly-held companies in which the entity has an equity ownership interest 2  
Number of privately-held companies in which the entity has an equity ownership interest 2  
Inventory Valuation [Abstract]    
Inventories | $ $ 9,319 $ 6,899