changes in accounting policies;
economic changes and overall market volatility;
In addition, stock markets generally have experienced, and in the future may experience significant price and volume volatility. This volatility has a substantial effect on the market prices of securities of many public companies for reasons frequently unrelated or disproportionate to the operating performance of the specific companies. Further, the securities of many medical device companies, including us, have historically been subject to extensive price and volume fluctuations that may affect the market price of their common stock. If these broad market fluctuations continue, it may have a material adverse impact on the market price of our common stock.
UNRESOLVED STAFF COMMENTS
As of December 31, 2017, we own approximately 905,000 square feet of space on 81 acres of land in Sunnyvale, California, where we house our headquarters, research and development, service and support functions, and certain of our manufacturing operations. In Norcross, Georgia, we own approximately 92,000 square feet of space on 10 acres which serves as our East Coast sales and training headquarters. In Aubonne, Switzerland, we own approximately 35,000 square feet of space on 2 acres, which is used for our headquarters outside of the U.S. and 15,000 square feet of space is leased to a third party. In Southaven, Mississippi, we lease 117,000 square feet of space for service operations and will be used for future expansion of our operations. In Tokyo, Japan and Seoul, South Korea, we lease 59,000 and 40,000 square feet, respectively, for our local training centers and sales operations. We lease 157,000 square feet in Mexicali, Mexico where we manufacture most of our EndoWrist instruments. We lease facilities in Milford, Connecticut; Raleigh, North Carolina; Blacksburg, Virginia; and San Francisco, California for research and development and other operations. We lease facilities for sales and operations in Osaka, Japan.
The information included in Note 7 to the Consolidated Financial Statements included in Part II, Item 8 of this report is incorporated herein by reference.
MINE SAFETY DISCLOSURES