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Investments
9 Months Ended
Sep. 30, 2017
Investments, All Other Investments [Abstract]  
Investments
Investments
Investments in Privately-held Companies    
As of September 30, 2017 and December 31, 2016, we held non-marketable equity investments of approximately $36.1 million in privately-held companies which are accounted for under the cost method. To date, we have not recognized any impairment losses on our investments.