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 fiscal year ended December 31, 2018 or ¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 (State or other jurisdiction of incorporati ...