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Long-term Borrowing | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Long-term Borrowing | 11. Long-term Borrowing On September 5, 2023, the Company entered into the Original Loan Agreement by and between the Company and the Bank. The Original Loan Agreement provided for a four-year senior secured credit facility in an aggregate principal amount of up to $50.0 million (the "Original Credit Facility"), of which $25.0 million became available upon the closing of a private placement of our common stock to selected institutional and accredited investors pursuant to a securities purchase agreement in September 2023 ("Term Loan A"), and the remaining $25.0 million could have been made available upon approval of the Bank in its discretion. The Original Credit Facility was to mature on August 1, 2027 (the "Original Maturity Date"). On June 28, 2024, the Company entered into the First Amendment, which, among other things, (i) increased the aggregate principal amount of the Original Credit Facility from up to $50 million to up to $100 million, of which the Term Loan A of $25 million was immediately available, an additional $25 million will become available upon the Company achieving certain milestones related to execution of a first line pivotal Phase 3 clinical trial of palazestrant in combination with ribociclib, and an additional $50 million which may be made available upon approval of the Bank, and (ii) extended the Original Maturity Date to July 1, 2028 ("Maturity Date"). On June 27, 2025, the Company entered into the Second Amendment (the Original Credit Facility, as amended, the "Credit Facility"), which, among other things, (i) decreased the interest rate to a floating rate equal to the greater of 6.0% or the prime rate, and (ii) extended the draw period for the Term Loan A to January 15, 2026. The obligations under the Loan Agreement are secured by substantially all of the assets of the Company, subject to limited exceptions. During the term of the Credit Facility, interest will accrue on any outstanding balance due under the Credit Facility at a floating rate per annum equal to the greater of (i) 6.0% and (ii) the prime rate. During an event of default, any outstanding amount under the Credit Facility will bear interest at a rate of 3.0% in excess of the otherwise applicable rate of interest. The Company will pay certain fees with respect to the Credit Facility, including a prepayment fee on any amount advanced under the Credit Facility to the extent paid prior to the Maturity Date, a final payment fee on the amount advanced under the Credit Facility. The Loan Agreement contains customary events of default, including, but not limited to, nonpayment of principal, interest, fees or other amounts; material inaccuracy of a representation or warranty; failure to perform or observe covenants; cross-defaults with certain other indebtedness; bankruptcy and insolvency events; material monetary judgment defaults; material adverse change occurs; delisting; and a material impairment in the Bank’s security interest. Upon the occurrence of an event of default (subject, in certain cases, to notice and grace periods), obligations under the Loan Agreement may be accelerated. The Loan Agreement also contains a number of customary representations, warranties and covenants that, among other things, limit the ability of the Company to (subject to certain qualifications and exceptions): create liens and encumbrances; incur additional indebtedness; merge, dissolve, liquidate or consolidate; make acquisitions, investments, advances or loans; dispose of or transfer assets; pay dividends or make other payments in respect of its capital stock; amend certain material documents; redeem or repurchase certain debt; make payments on subordinated debt; and engage in certain transactions with affiliates. As of September 30, 2025, the Company had drawn $3.0 million from the Credit Facility which was recorded at cost and presented as long-term borrow ing on the condensed consolidated balance sheet. The interest expense was less than $0.1 million for the three months and nine months ended September 30, 2025, which was included in other income on the condensed consolidated statements of operations and comprehensive loss.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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