Rent expense was $0.1 million and $12,000 for the years ended December 31, 2019 and 2018, respectively. On May 22, 2019, the Company entered into an office sublease agreement for 4,677 square feet in San Diego, California (“San Diego Lease”) which expires on March 31, 2021. Base rent is approximately $166,000 annually and the monthly rent expense is being recognized on a straight-line basis over the lease term.

The San Diego Lease is included in the accompanying consolidated balance sheet at the present value of the lease payments. As the San Diego Lease does not have an implicit interest rate, the present value reflects a 10.0% discount rate which is the estimated rate of interest that the Company would have to pay in order to borrow an amount equal to the lease payments on a collateralized basis over a similar term and in a similar economic environment. The Company recognized a net operating lease right-of-use asset and an aggregate lease liability of $0.2 million as of December 31, 2019, in the accompanying consolidated balance sheet. The weighted average remaining lease term was 1.25 years.

Maturities of lease liabilities due under this lease agreement as of December 31, 2019, are as follows (in thousands):

Maturity of lease liabilities	Operating Leases
2020	$	166
2021		41
Total lease payments		207
Less imputed interest		(17	)
Total operating lease liabilities		190
Less current portion of lease liability		(99	)
Lease liability	$	91

In January 2019, the Company engaged Newfront Insurance as its primary insurance broker. The son of Richard Vincent, the Company’s Chief Financial Officer, acted as the Company’s agent at Newfront Insurance. The Company paid total related policy premiums of approximately $1.2 million during the year ending December 31, 2019, for which Mr. Vincent’s son received a commission of approximately $0.1 million.

In September 2019, the Company entered into a consulting agreement with Robert J. Wills. Ph.D., a member of the Company’s Board of Directors, whereby Dr. Wills will provide services related to the potential out-licensing or sale of the SARM and/or SARD technology. The Company recorded approximately $3,500 in related services during the year ended December 31, 2019.

Effective in September 2019, the Company and Shanghai Pharmaceutical (USA) Inc. (“SPH USA”) entered into a Materials Supply and Services Agreement (“SPH USA Services Agreement”), pursuant to which the Company and SPH USA will execute various statements of work for the transfer to SPH USA of key reagents and other materials, and for the supply of certain services by the Company to SPH USA, as contemplated under and in furtherance of the License and Development Agreement between the Company and SPH USA effective as of November 2018. During the year ended December 31, 2019, the Company recorded amounts receivable from SPH USA related to statements of work totaling $0.2 million. See Notes 4 and 6.

Between April 10 and May 1, 2019, three putative class action lawsuits and one individual lawsuit were filed in the U.S. District Court for the District of Delaware: Wheby v. GTx, Inc. et al., Miller v. GTx, Inc. et al., Tabb v. GTx, Inc. et al., and Living Seas LLC v. GTx, Inc. et al. (collectively, the “Delaware Actions”). On April 11 and 23, 2019, two putative class actions were filed in the U.S. District Court for the Southern District of New York: Kopanic v. GTx, Inc. et al. and Cooper v. GTx, Inc. et al. (collectively, the “New York Actions” and, together with the Delaware Actions, the “Actions”). The Actions name as defendants the Company and its former board of directors, and, in the case of the Wheby and Miller actions, Private Oncternal and Merger Sub. The Actions allege that defendants violated Sections 14(a) and 20(a) of the Exchange Act, as well as Rule 14a-9 promulgated thereunder, in connection with the company's filing of the Registration Statement in connection with the Merger. The Delaware Actions have now been voluntarily dismissed with prejudice: the Wheby action on June 12, 2019; the Miller action on July 15, 2019; the Living Seas action on June 26, 2019; and the Tabb action on October 21, 2019. On September 16, 2019, Plaintiffs in the New York Actions filed an amended complaint, alleging violations of Sections 14(a) and 20(a) of the Exchange Act related to the value GTx’s stockholders received in the Merger. The complaint seeks damages and other unspecified relief. On January 10, 2020, the defendants filed their motion to dismiss the amended complaint, on January 31, 2020, the plaintiffs filed their opposition to defendants’ motion to dismiss, and on February 14, 2020, the defendants filed a reply in support of their motion to dismiss. The defendants’ motion to dismiss is pending. The Company believes that the New York Actions are without merit and intends to vigorously defend these actions. The Company cannot predict the outcome of or estimate the possible loss or range of loss from any of these matters.

On October 15, 2019, Joseph Zappia and Karen Zappia filed a lawsuit against us in the U.S. District Court for the District of Delaware. The complaint alleges that our former management (prior to the Merger) engaged in illegal insider trading and false, manipulative and deceptive practices in violation of Sections 10(b) (and Rule 10b-5 promulgated thereunder), with respect to the timing of the disclosure of failed clinical trial results of GTx’s enobosarm product candidate in September 2018. The plaintiffs seek damages, interest, costs, attorneys' fees. We believe that this lawsuit is without merit and intend to vigorously defend this matter. We cannot predict the outcome of or estimate the possible loss or range of loss from this matter.