Other Income (Expense), Net
Other income (expense), net is primarily comprised of net interest expense. During the years ended December 31, 2013 and 2014, our interest expense, net was $11.8 million and $6.0 million, respectively, representing a decrease of $5.8 million. During the year ended December 31, 2014, as compared to the year ended December 31, 2013, the net interest expense decreased primarily due to a $5.4 million decrease in the amount of amortization of debt discount recognized during the years ending December 31, 2013 and 2014, respectively.
Liquidity and Capital Resources
We have incurred losses since the inception of our earlier-formed Predecessor, vTvx Holdings I, in 1998 and as of March 31, 2015, we had a members’ deficit of approximately $561.2 million. Since our inception, MacAndrews and certain affiliates have provided funding to our Predecessors in the form of debt and equity in excess of $200 million. M&F TTP Holdings LLC is currently providing funding for the fiscal 2015 operations of our Predecessors, including all operating, investing and financing cash flow needs. Additionally, our Predecessors have obtained a binding commitment from MacAndrews to continue funding their operations at a level necessary for our Predecessors to meet their financial obligations, if necessary, through at least January 1, 2016. vTv Therapeutics Inc. will not have the benefit of this commitment following the completion of the Reorganization Transactions and this offering.
We believe that, after the consummation of this offering, we will continue to meet our liquidity requirements over at least the next 12 months. In the event we are not successful at completing this offering, our shareholders have represented to us that they have the current intent and ability to fund our operations, if necessary, through at least January 1, 2016. We anticipate that we will continue to incur losses for at least the next several years. We expect that our research and development and general and administrative expenses will continue to increase and, as a result, we will need additional capital to fund our operations, which we may obtain through one or more of equity offerings, debt financings, strategic alliances and licensing or collaboration arrangements.
Since our inception through March 31, 2015, we have funded our operations principally through the receipt of funds from the private placement of approximately $109.3 million of preferred equity securities, approximately $248.3 million from license and research collaborations and debt financings totaling approximately $150.8 million. As of March 31, 2015, we had cash and cash equivalents of approximately $0.8 million. Cash in excess of immediate requirements is invested in accordance with our investment policy, primarily with a view to liquidity and capital preservation.
On August 9, 2013, we refinanced a previously existing $94.1 million unsecured note, evidencing amounts borrowed from MacAndrews & Forbes Group, LLC, with new promissory notes (the “2013 Promissory Notes”) and new redeemable preferred units, pursuant to a Note and Equity Issuance Agreement (the “Note and Equity Issuance Agreement”). The 2013 Promissory Notes, for which M&F TTP Holdings LLC acted as principal lender, had an original principal amount of $94.1 million and bore interest at an annual rate of LIBOR plus 2%. The 2013 Promissory Notes provided that the outstanding balance plus accrued and unpaid interest was due on December 31, 2014 or earlier upon the occurrence of “prepayment events.” The new promissory notes were secured by substantially all of our assets.
On December 24, 2013, we amended the Note and Equity Issuance Agreement to provide for additional advances that could be made at the option of M&F TTP Holdings LLC. The additional advances were also secured by substantially all of our assets and bore interest at an annual rate of LIBOR plus 10%. The additional advances were subject to the same prepayment provisions as the advances made under the initial Note and Equity Issuance Agreement.
On March 28, 2014, we, M&F TTP Holdings LLC and certain of our affiliates and employees agreed to exchange all $116.2 million of outstanding principal and interest under the Note and Equity Issuance Agreement (including amounts advanced under the initial agreement and the 2013 Promissory Notes and amounts advanced following the December 24, 2013 amendment) for 292,722,844 Series F redeemable convertible preferred units of vTvx Holdings I and 155,219,376 Series B redeemable convertible preferred units of vTvx Holdings II. Concurrently on March 28, 2014, we entered into an Uncommitted Advance Agreement with M&F TTP Holdings LLC and a former officer and director. The former officer and director is no longer party to the agreement. Under the Uncommitted Advance Agreement, advances are made by