Investments

12 Months Ended

Dec. 31, 2016

Investments, All Other Investments [Abstract]

Investments

Investments

Investments in Privately Held Companies

As of December 31, 2016 and 2015, we held non-marketable equity investments of approximately $36.1 million and $33.6 million, respectively, in privately held companies which are accounted for under the cost method. During the year ended 2016 we made an additional investment of $2.5 million in one of these companies. To date, we have not recognized any impairment losses on our investments.