General and Administrative Expenses. General and administrative expenses for the three months ended March 31, 2022 were $1.2 million compared to $2.3 million for the three months ended March 31, 2021, a decrease of $1.1 million, or 46%. The decrease was due to fewer consulting, labor and stock-based compensation costs.
Change in Fair Value of Common Stock Warrant Liability. Change in fair value of common stock warrant liability for the three months ended March 31, 2022 was zero compared to expense of $0.4 million for the three months ended March 31, 2021. The warrants were issued in November 2016 and May 2017 and the change in the liability fair value was due to a change in our stock price, volatility and a shorter remaining term.
Liquidity and Capital Resources
In the course of our development activities, we have sustained operating losses and expect such losses to continue over the next several years. We expect to continue to incur significant expenses and operating losses for the foreseeable future as we continue to develop, conduct clinical trials and seek regulatory approval for our product candidates. Our primary uses of capital are, and we expect will continue to be, compensation and related expenses, third-party clinical research and development services, contract manufacturing services, laboratory and related supplies, clinical costs, legal and other regulatory expenses and general overhead costs.
If we obtain regulatory approval for any of our product candidates, we expect to incur significant commercialization expenses. We do not have a sales, marketing, manufacture or distribution infrastructure for a pharmaceutical product. To develop a commercial infrastructure, we will have to invest financial and management resources, some of which would have to be deployed prior to having any certainty of marketing approval.
We had unrestricted cash and cash equivalents of $20.0 million as of March 31, 2022. Our existing cash and cash equivalents as of March 31, 2022 will be used primarily to fund the Phase 3 trial of INOpulse for fILD.
The State of New Jersey’s Technology Business Tax Certificate Transfer Program enables qualified, unprofitable New Jersey based technology or biotechnology companies to sell a percentage of NOL and research and development (R&D) tax credits to unrelated profitable corporations, subject to meeting certain eligibility criteria. Based on consideration of various factors, including application processing time and past trend of benefits made available under the program, we believe that it is probable that our plans to sell our NOLs can be effectively implemented to address our short term financial needs. We sold $16.4 million of state NOLs and $0.3 million of Research and Development credits under the State of New Jersey’s Technology Business Tax Certificate Transfer Program in June 2021 for net proceeds of $1.7 million. During April 2022, we completed the sale of $25.1 million of state NOLs and $0.2 million of Research and Development credits under the State of New Jersey’s Technology Business Tax Certificate Transfer Program for net proceeds of $2.2 million. We plan to sell additional NOLs and R&D credits under the same program in the future subject to program availability and state approval. The proceeds from such sales are recorded as Income tax benefit when sales occur or proceeds are received.
We evaluated whether there are any remaining conditions and events, considered in the aggregate, that raise substantial doubt about our ability to continue as a going concern within one year beyond the filing of this Quarterly Report on Form 10-Q.
Based on such evaluation and our current plans, we believe that our existing cash and cash equivalents as of March 31, 2022 and $2.2 million in net proceeds available from the sale of state NOLs and R&D credit under the State of New Jersey’s Technology Business Tax Certificate Transfer Program, will not be sufficient to satisfy our operating cash needs for at least one year after the filing of this Quarterly Report on Form 10-Q.
We have based our estimates on assumptions that may prove to be wrong, and we may exhaust our capital resources sooner than we expect. In addition, the process of testing product candidates in clinical trials is costly, and the timing of progress in clinical trials is uncertain. Because our product candidates are in clinical development and the outcome of these efforts is uncertain, we may not be able to accurately estimate the actual amounts that will be necessary