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Debt | 12 Months Ended
--- | ---
Dec. 31, 2023
Debt Disclosure [Abstract] |
Debt | 10. Debt Debt, long-term consists of the following commitments as of December 31, 2023 and 2022 (in thousands):
|  | As of December 31,
|  | 2023 |  | 2022
Convertible notes |  | $ | 788,909 |  |  | $ | 785,621 |
Term Loan |  | 366,404 |  |  | 339,629 |
Debt, long-term |  | $ | 1,155,313 |  |  | $ | 1,125,250 |
Secured Senior Term Loan In October 2022, the Company entered into a $350 million Term Loan with Pharmakon that matures on October 19, 2027. The Term Loan bears interest at a rate based upon the SOFR, subject to a SOFR floor of 2.5%, in addition to a margin of 7.75% per annum. Up to 50% of the interest payable during the first 24 months from the closing of the Term Loan may be paid-in-kind at the Company's election. If elected, paid-in-kind interest will be capitalized and added to the principal amount of the Term Loan. The Term Loan, including the paid-in-kind interest, will be repaid in eight equal quarterly payments starting in the 13th quarter following the closing of the Term Loan (i.e., the quarter ending March 31, 2026), except that the repayment start date may be extended at the Company's option for an additional four quarters, so that repayments start in the 17th quarter following the closing of the Term Loan, subject to the achievement of specified ARIKAYCE data thresholds and certain other conditions. Net proceeds from the Term Loan, after deducting the lenders fees and deal expenses of $15.1 million, were $334.9 million. The following table presents the carrying value of the Company’s Term Loan balance as of December 31, 2023 and 2022 (in thousands):
|  | As of December 31,
|  | 2023 |  | 2022 |  |
Original Term Loan balance |  | $ | 350,000 |  |  | $ | 350,000 |  |  |
Paid-in-kind interest capitalized |  | 27,537 |  |  | 4,165 |  |  |
Term Loan issuance costs, unamortized |  | (11,133) |  |  | (14,536) |  |  |
Term Loan |  | $ | 366,404 |  |  | $ | 339,629 |  |  |
Convertible Notes In May 2021, the Company completed an underwritten public offering of the 2028 Convertible Notes, in which the Company sold $575.0 million aggregate principal amount of the 2028 Convertible Notes, including the exercise in full of the underwriters' option to purchase an additional $75.0 million in aggregate principal amount of 2028 Convertible Notes. The Company's net proceeds from the offering, after deducting underwriting discounts and commissions and other offering expenses of $15.7 million, were approximately $559.3 million. The 2028 Convertible Notes bear interest payable semiannually in arrears on June 1 and December 1 of each year, beginning on December 1, 2021. The 2028 Convertible Notes mature on June 1, 2028, unless earlier converted, redeemed, or repurchased. In January 2018, the Company completed an underwritten public offering of the Convertible Notes, in which the Company sold $450.0 million aggregate principal amount of the 2025 Convertible Notes, including the exercise in full of the underwriters' option to purchase an additional $50.0 million in aggregate principal amount of 2025 Convertible Notes. The Company's net proceeds from the offering, after deducting underwriting discounts and commissions and other offering expenses of $14.2 million, were approximately $435.8 million. The 2025 Convertible Notes bear interest payable semiannually in arrears on January 15 and July 15 of each year, beginning on July 15, 2018. The 2025 Convertible Notes mature on January 15, 2025, unless earlier converted, redeemed, or repurchased. A portion of the net proceeds from the 2028 Convertible Notes was used to repurchase $225.0 million of the Company's outstanding 2025 Convertible Notes. The Company recorded a loss on early extinguishment of debt of $17.7 million, primarily related to the premium paid on extinguishment of a portion the 2025 Convertible Notes. On or after October 15, 2024, until the close of business on the second scheduled trading day immediately preceding January 15, 2025, holders may convert their 2025 Convertible Notes at any time. The initial conversion rate for the 2025 Convertible Notes is 25.5384 shares of common stock per $1,000 principal amount of 2025 Convertible Notes (equivalent to an initial conversion price of approximately $39.16 per share of common stock). On or after March 1, 2028, until the close of business on the second scheduled trading day immediately preceding June 1, 2028, holders may convert their 2028 Convertible Notes at any time. The initial conversion rate for the 2028 Convertible Notes is 30.7692 shares of common stock per $1,000 principal amount of 2028 Convertible Notes (equivalent to an initial conversion price of approximately $32.50 per share of common stock). Upon conversion of either the 2025 Convertible Notes or the 2028 Convertible Notes, holders may receive cash, shares of the Company's common stock or a combination of cash and shares of the Company's common stock, at the Company's option. The conversion rates will be subject to adjustment in some events but will not be adjusted for any accrued and unpaid interest. Holders may convert their 2025 Convertible Notes prior to October 15, 2024 or their 2028 Convertible Notes prior to March 1, 2028, only under the following circumstances, subject to the conditions set forth in the applicable indenture: (i) during the five business day period immediately after any five consecutive trading day period (the measurement period) in which the trading price per $1,000 principal amount of the applicable series of convertible notes, as determined following a request by a holder of such 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 common stock and the conversion rate on such trading day, (ii) the Company elects to distribute to all or substantially all holders of the common stock (a) any rights, options or warrants (other than in connection with a stockholder rights plan for so long as the rights issued under such plan have not detached from the associated shares of common stock) entitling them, for a period of not more than 45 days from the declaration date for such distribution, to subscribe for or purchase shares of common stock at a price per share that is less than the average of the last reported sale prices of the common stock for the 10 consecutive trading day period ending on, and including, the trading day immediately preceding the declaration date for such distribution, or (b) the Company's assets, debt securities or rights to purchase securities of the Company, which distribution has a per share value, as reasonably determined by the board of directors, exceeding 10% of the last reported sale price of the common stock on the trading day immediately preceding the declaration date for such distribution, (iii) if a transaction or event that constitutes a fundamental change or a make-whole fundamental change occurs, or if the Company is a party to (a) a consolidation, merger, combination, statutory or binding share exchange or similar transaction, pursuant to which the common stock would be converted into, or exchanged for, cash, securities or other property or assets, or (b) any sale, conveyance, lease or other transfer or similar transaction in one transaction or a series of transactions of all or substantially all of the consolidated assets of the Company and its subsidiaries, taken as a whole, all or any portion of the applicable series of convertible notes may be surrendered by a holder for conversion at any time from or after the date that is 30 scheduled trading days prior to the anticipated effective date of the transaction, (iv) if during any calendar quarter commencing after the calendar quarter ending on March 31, 2018 or June 30, 2021 for the 2025 Convertible Notes and the 2028 Convertible Notes, respectively (and only during such calendar quarter), the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during the 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, or (v) if the Company sends a notice of redemption, a holder may surrender all or any portion of its convertible notes to which the notice of redemption relates for conversion at any time on or after the date the applicable notice of redemption was sent until the close of business on (a) the second business day immediately preceding the related redemption date or (b) if the Company fails to pay the redemption price on the redemption date as specified in such notice of redemption, such later date on which the redemption price is paid. To date, there have not been any holder-initiated redemption requests of either series of convertible notes. Each series of convertible notes can be settled in cash, common stock, or a combination of cash and common stock at the Company's option, and thus, the Company determined the embedded conversion options in both series of convertible notes are not required to be separately accounted for as a derivative. However, since the convertible notes are within the scope of the accounting guidance for cash convertible instruments, the Company is required to separate each series of convertible notes into liability and equity components. The carrying amount of the liability component of each series of convertible notes as of the date of issuance was calculated by measuring the fair value of a similar liability that did not have an associated equity component. The fair value was based on data from readily available pricing sources which utilize market observable inputs and other characteristics for similar types of instruments. The carrying amount of the equity component representing the embedded conversion option for each series of convertible notes was determined by deducting the fair value of the liability component from the gross proceeds of the applicable convertible notes. The excess of the principal amount of the liability component over its carrying amount is amortized to interest expense over the expected life of a similar liability that does not have an associated equity component using the effective interest method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification in the accounting guidance for contracts in an entity’s own equity. The fair value of the liability component of the 2025 Convertible Notes on the date of issuance was estimated at $309.1 million using an effective interest rate of 7.6% and, accordingly, the residual equity component on the date of issuance was $140.9 million. The fair value of the liability component of the 2028 Convertible Notes on the date of issuance was estimated at $371.6 million using an effective interest rate of 7.1% and, accordingly, the residual equity component on the date of issuance was $203.4 million. The respective discounts were amortized to interest expense over the term of the applicable series of convertible notes through December 31, 2021, prior to the adoption of ASU 2020-06. The 2025 Convertible Notes and the 2028 Convertible Notes have remaining periods of approximately 1.04 years and 4.42 years, respectively. The following table presents the carrying value of the Company’s debt balance as of December 31, 2023 and 2022 (in thousands):
| As of December 31,
| 2023 |  | 2022
Face value of outstanding convertible notes | $ | 800,000 |  |  | $ | 800,000 |
Debt issuance costs, unamortized | (11,091) |  |  | (14,379) |
Convertible notes | $ | 788,909 |  |  | $ | 785,621 |
As of December 31, 2023, future principal repayments of debt for each of the fiscal years through maturity were as follows (in thousands):
Year Ending December 31: |  |
2024 |  | $ | — |
2025 |  | 225,000 |
2026 |  | 188,769 |
2027 |  | 188,768 |
2028 |  | 575,000 |
2029 and thereafter |  | — |
|  | $ | 1,177,537 |
The estimated fair value of the debt (categorized as a Level 2 li ability for fair value measurement purposes) is determined using current market factors and the ability of the Company to obtain debt at comparable terms to those that are currently in place. Interest expense for the years ended December 31, 2023, 2022, and 2021, is as follows (in thousands):
|  | Years Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Convertible debt contractual interest expense |  | $ | 8,250 |  |  | $ | 8,250 |  |  | $ | 8,134 |
Term Loan contractual interest expense |  | 46,743 |  |  | 8,330 |  |  | — |
Royalty Financing Agreement non-cash interest expense |  | 18,846 |  |  | 3,687 |  |  | — |
Amortization of debt issuance costs |  | 7,320 |  |  | 3,991 |  |  | 1,890 |
Amortization of debt discount |  | — |  |  | — |  |  | 29,149 |
Swap interest (income) expense |  | (1,882) |  |  | 380 |  |  | — |
Total debt interest expense |  | $ | 79,277 |  |  | $ | 24,638 |  |  | $ | 39,173 |
Finance lease interest expense |  | 2,417 |  |  | 1,808 |  |  | 1,300 |
Total interest expense |  | $ | 81,694 |  |  | $ | 26,446 |  |  | $ | 40,473 |
In accordance with the Company's transition using the modified retrospective method upon adopting ASU 2020-06 on January 1, 2022, the Company ceased accreting debt discount.

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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 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//470/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I + Details
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