Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 __________________ FORM 10-K __________________ x Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Annual Period Ended December 31, 2018 or 919 E. Hillsdale Boulevard, 4th Floor, Foster City, California 94404 (Address of principal executive offices, including zip code) (650) 801-6100 (Registrant's telephone number, including area code) __________________ Securities registered ...