liver. The first symptoms are typically fatigue, itching and jaundice, and many patients with sclerosing cholangitis also suffer from inflammatory bowel disease. The estimated incidence of primary sclerosing cholangitis is 9 cases per 100,000 people. There are currently no drugs approved for the treatment of sclerosing cholangitis. First-line treatment is typically off-label UDCA, although UDCA has not been established to be safe and effective in patients with sclerosing cholangitis in well controlled clinical trials.
Since inception, we have incurred significant operating losses. As of September 30, 2022, we had an accumulated deficit of $421.0 million. To date, we have financed our operations primarily through issuances of equity or convertible debt, upfront fees paid upon entering into license agreements, payments received upon the achievement of specified milestone events under license agreements, grants and venture debt borrowings, the HealthCare Royalty Partners III, L.P. (HCR) royalty monetization transactions, and the Sagard Healthcare Partners (Delaware) LP (“Sagard”) royalty monetization transactions.
As previously disclosed, on September 22, 2022, we entered into a purchase and sale agreement with Sagard for the sale of a royalty on revenues generated from Bylvay (odevixibat), or the Purchase Agreement, for an aggregate purchase price of $115.0 million payable upon the closing of the transaction, which occurred on September 22, 2022. In consideration for the payment of such purchase price, Sagard is entitled to receive tiered, sales-based royalty payments on the worldwide annual consolidated net revenues of Bylvay. These royalty obligations payable to Sagard are capped at $184.0 million which will be increased to $230.0 million if Sagard has not received aggregate royalty payments of $184.0 million by December 31, 2028. In addition, if the aggregate amount of royalty payments received by Sagard as of December 31, 2036 is less than $230.0 million, we have agreed to pay Sagard the difference between the royalty cap and the aggregate amount of all royalty payments received by Sagard as of December 31, 2036. See Note 1 to the condensed consolidated financial statements in Part I, Item 1 of this report for additional information about our obligations under the Purchase Agreement.
We expect to continue to incur significant expenses and increasing operating losses as we continue our development of, and seek marketing approvals for, our product candidates, commercialize Bylvay, prepare for and begin the commercialization of any other approved products in the future, and add infrastructure and personnel to support our product development and commercialization efforts and operations as a public company in the United States. To date, inflation has not had a material impact on our business, but if the global inflationary trends continue, we expect appreciable increases in clinical trial, selling, labor, and other operating costs. If our costs were to become subject to significant inflationary pressures, we may not be able to fully offset such higher costs through price increases of our product. Our inability or failure to do so could adversely affect our business, financial condition and results of operations.
As a commercial-stage company, our revenues, expenses and results of operations are likely to fluctuate significantly from quarter to quarter and year to year. We believe that period-to-period comparisons of our results of operations should not be relied upon as indicative of our future performance.
As of September 30, 2022, we had approximately $272.5 million in cash, cash equivalents and restricted cash.
Financial Operations Overview
The following discussion sets forth certain components of our consolidated statements of operations as well as factors that impact those items.
Revenue
We generate revenue primarily from the receipt of royalty revenue, upfront or license fees and milestone payments as well as product revenue following our commercial launch of Bylvay. License agreements with commercial partners generally include nonrefundable upfront fees and milestone payments. We recognize revenue on sales of Bylvay when a customer obtains control of the product, which occurs at a point in time and upon delivery, the receipt of which is dependent upon the achievement of specified development, regulatory or commercial milestone events, as well as royalties on product sales of licensed products, if and when such product sales occur, and payments for pharmaceutical