UNITED STATES SECURITIES AND EXCHANGE COMMISSION ¨ Washington, D.C. 20549 __________________________ Form 10-K (Mark One) þ 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 For the transition period from to Commission file number: 001-15787 | --- | --- | --- | |---------------------------------------------------------------------------- ...