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Debt | 6 Months Ended
--- | ---
Jun. 30, 2024
Debt Disclosure [Abstract] |
Debt | 9. Debt Liability for sale of future royalties The following table shows the activity within the “liability for sale of future royalties- current” and “liability for sale of future royalties- noncurrent” accounts for the six months ended June 30, 2024: ​
​ | ​ | ​ | ​ | ​
​ |  | Six Months Ended June 30, | ​
Liability for sale of future royalties- (current and noncurrent) | ​ | 2024 | ​
Beginning balance as of December 31, 2023 | ​ | $ | 1,814,097 | ​
Less: Non-cash royalty revenue payable to Royalty Pharma | ​ | ​ | (73,349) | ​
Plus: Non-cash interest expense recognized | ​ | ​ | 102,340 | ​
Plus: Cash received from Royalty Pharma | ​ | ​ | 241,792 | ​
Ending balance | ​ | $ | 2,084,880 | ​
Effective interest rate as of June 30, 2024 | ​ |  | 9.9% | ​
​ Non-cash interest expense is recorded in the statement of operations within “Interest expense, net”. ​ Senior Secured Term Loan ​ On October 27, 2022 (the “Closing Date”), the Company entered into a credit agreement (the “Blackstone Credit Agreement”) for fundings of up to $950.0 million consisting of a committed loan facility of $450.0 million and further contemplating the potential for up to $500.0 million of additional financing, to the extent that the Company requested such additional financing and subject to the Lenders’ agreement to provide such additional financing and to mutual agreement on terms, among the Company, certain subsidiaries of the Company (together with the Company, the “Loan Parties”) and funds and other affiliated entities advised or managed by Blackstone Life Sciences and Blackstone Credit (collectively, “Blackstone”, and such lenders, together with their permitted assignees, the “Lenders” and each a “Lender”) and Wilmington Trust, National Association, as the administrative agent for the Lenders. ​ The Blackstone Credit Agreement provided for a senior secured term loan facility funded on the Closing Date in the aggregate principal amount of $300.0 million (the “Initial Loans”) and a committed delayed draw term loan facility of up to $150.0 million (the “Delayed Draw Loans” and, together with the Initial Loans, the “Loans”) to be funded at the Company’s request within 18 months of the Closing Date subject to specified conditions. In addition, the Blackstone Credit Agreement contemplated the potential for further financings by Blackstone, by providing for incremental discretionary uncommitted further financings of up to $500.0 million. The Company capitalized approximately $11.6 million of debt issuance costs which are presented on the balance sheet as a direct deduction from the debt liability and are being amortized over the term of the senior secured term loan facility using the effective interest rate method. ​ The Loans were to mature on the date that is seven years from the Closing Date. Borrowings under the Blackstone Credit Agreement bore interest at a variable rate equal to, at the Company’s option, either an adjusted Term SOFR rate plus seven and a quarter percent (7.25%) or the Base Rate plus six and a quarter percent (6.25%), subject to a floor of one percent (1%) and two percent (2%) with respect to Term SOFR rate and Base Rate (each as defined in the Blackstone Credit Agreement), respectively. Payment of the Loans were subject to certain premiums specified in the Blackstone Credit Agreement, in each case, from the date of the applicable Loan funded. ​ On October 19, 2023, the Company terminated the Blackstone Credit Agreement. In connection with the termination of the Credit Agreement, the Company repaid outstanding principal of $300.0 million, accrued interest of $2.1 million, an additional $82.0 million in prepayment premiums, exit fees, and creditor expenses, and $0.2 million in legal fees. The Company recorded a loss on the extinguishment of debt of $92.7 million which was included on the statement of operations for the period ended December 31, 2023. The loss on extinguishment of debt consisted of $82.0 million in prepayment premiums, exit fees, and creditor expenses and debt issuance costs of $10.7 million. All liens and security interests securing the loans made pursuant to the Blackstone Credit Agreement were released upon termination. ​ The Blackstone Credit Agreement consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2024 | ​ | December 31, 2023
Principal | ​ | $ | — | ​ | $ | 300,000
Less: Debt issuance costs | ​ |  | — | ​ | ​ | —
Repayment of senior secured term loan | ​ | ​ | — | ​ | ​ | (300,000)
Net carrying amount | ​ | $ | — | ​ | $ | —
​ ​ The following table sets forth total interest expense recognized related to the Blackstone Credit Agreement: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended | ​ | Six Months Ended | ​
​ | June 30, | ​ | June 30, | ​
​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023 | ​
Contractual interest expense | $ | — | ​ | $ | 9,354 | ​ | $ | — | ​ | $ | 18,532 | ​
Amortization of debt issuance costs |  | — | ​ |  | 272 | ​ | ​ | — | ​ | ​ | 423 | ​
Total | $ | — | ​ | $ | 9,626 | ​ | $ | — | ​ | $ | 18,955 | ​
Effective interest rate | ​ | — | % | ​ | 13.4 | % | ​ | — | % | ​ | 13.4 | %
​ ​ 2026 Convertible Notes In September 2019, the Company issued, at par value, $287.5 million aggregate principal amount of 1.50% convertible senior notes due 2026, which included an option to purchase up to an additional $37.5 million in aggregate principal amount of the 2026 Convertible Notes, which was exercised in full by the initial purchasers. The 2026 Convertible Notes bear cash interest at a rate of 1.50% per year, payable semi-annually on March 15 and September 15 of each year, beginning on March 15, 2020. The 2026 Convertible Notes will mature on September 15, 2026, unless earlier repurchased or converted. The net proceeds to the Company from the offering were $279.3 million after deducting the initial purchasers’ discounts and commissions and the offering expenses payable by the Company. The 2026 Convertible Notes are governed by an indenture (the "2026 Convertible Notes Indenture") with U.S Bank National Association as trustee (the "2026 Convertible Notes Trustee"). Holders of the 2026 Convertible Notes may convert their 2026 Convertible Notes at their option at any time prior to the close of business on the business day immediately preceding March 15, 2026 only under the following circumstances:
| ● | during any calendar quarter commencing on or after December 31, 2019 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;
| ● | during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price (as defined in the 2026 Convertible Notes Indenture) per $1,000 principal amount of 2026 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day;
| ● | during any period after the Company has issued notice of redemption until the close of business on the scheduled trading day immediately preceding the relevant redemption date; or
| ● | upon the occurrence of specified corporate events.
On or after March 15, 2026, until the close of business on the business day immediately preceding the maturity date, holders may convert their 2026 Convertible Notes at any time, regardless of the foregoing circumstances. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of the Company’s common stock or any combination thereof at the Company’s election. The conversion rate for the 2026 Convertible Notes was initially, and remains, 19.0404 shares of the Company’s common stock per $1,000 principal amount of the 2026 Convertible Notes, which is equivalent to an initial conversion price of approximately $52.52 per share of the Company’s common stock. The conversion rate may be subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. The Company was not permitted to redeem the 2026 Convertible Notes prior to September 20, 2023. The Company may redeem for cash all or any portion of the 2026 Convertible Notes, at its option, if the last reported sale price of its common stock has been at least 130% of the conversion price then in effect on the last trading day of, and for at least 19 other trading days (whether or not consecutive) during, any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the 2026 Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the 2026 Convertible Notes, which means that the Company is not required to redeem or retire the 2026 Convertible Notes periodically. If the Company undergoes a “fundamental change” (as defined in the 2026 Convertible Notes Indenture), subject to certain conditions, holders of the 2026 Convertible Notes may require the Company to repurchase for cash all or part of their 2026 Convertible Notes at a repurchase price equal to 100% of the principal amount of the 2026 Convertible Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. The 2026 Convertible Notes represent senior unsecured obligations and will rank senior in right of payment to the Company’s future indebtedness that is expressly subordinated in right of payment to the notes, equal in right of payment to the Company’s existing and future unsecured indebtedness that is not so subordinated, effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness, and structurally subordinated to all existing and future indebtedness and other liabilities (including trade payables) incurred by the Company’s subsidiaries. The 2026 Convertible Notes Indenture contains customary events of default with respect to the 2026 Convertible Notes, including that upon certain events of default (including the Company’s failure to make any payment of principal or interest on the 2026 Convertible Notes when due and payable) occurring and continuing, the 2026 Convertible Notes Trustee by notice to the Company, or the holders of at least 25% in principal amount of the outstanding 2026 Convertible Notes by notice to the Company and the Convertible Notes Trustee, may, and the 2026 Convertible Notes Trustee at the request of such holders (subject to the provisions of the 2026 Convertible Notes Indenture) shall, declare 100% of the principal of and accrued and unpaid interest, if any, on all the 2026 Convertible Notes to be due and payable. In case of certain events of bankruptcy, insolvency or reorganization, involving the Company or a significant subsidiary, 100% of the principal of and accrued and unpaid interest on the 2026 Convertible Notes will automatically become due and payable. Upon such a declaration of acceleration, such principal and accrued and unpaid interest, if any, will be due and payable immediately. The 2026 Convertible Notes consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024 | ​ | December 31, 2023 | ​
Principal | ​ | $ | 287,500 | ​ | $ | 287,500 | ​
Less: Debt issuance costs | ​ |  | (2,694) | ​ |  | (3,287) | ​
Net carrying amount | ​ | $ | 284,806 | ​ | $ | 284,213 | ​
As of June 30, 2024, the remaining contractual life of the 2026 Convertible Notes is approximately 2.2 years. The following table sets forth total interest expense recognized related to the 2026 Convertible Notes: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended June 30, | ​ | ​ | Six Months Ended June 30, | ​
​ |  | 2024 | ​ | 2023 |  | 2024 | ​ | 2023 | ​
Contractual interest expense | ​ | $ | 1,066 | ​ | $ | 1,066 | ​ | $ | 2,142 | ​ | $ | 2,135 | ​
Amortization of debt issuance costs | ​ |  | 295 | ​ | ​ | 290 | ​ | ​ | 591 | ​ | ​ | 578 | ​
Total | ​ | $ | 1,361 | ​ | $ | 1,356 | ​ | $ | 2,733 | ​ | $ | 2,713 | ​
Effective interest rate | ​ |  | 1.9 | % | ​ | 1.9 | % | ​ | 1.9 | % | ​ | 1.9 | %
​

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