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Debt | 3 Months Ended
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Mar. 31, 2023
Debt Disclosure [Abstract] |
Debt | 9. Debt 2021 Convertible Senior Notes In September 2021, we issued $345.0 million aggregate principal amount of 0.25% convertible senior notes due 2026 (the “Notes”). The Notes were issued in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”). The net proceeds from the sales of the Notes was approximately $335.0 million after deducting offering and issuance costs related to the Notes and before the 2021 Capped Call transactions, as described below. The Notes are our senior, unsecured obligations and accrue interest at a rate of 0.25% per annum, payable semi-annually in arrears on April 1 and October 1 of each year, beginning on April 1, 2022. The Notes will mature on October 1, 2026, unless earlier converted, redeemed or repurchased by us. Before July 1, 2026, noteholders will have the right to convert their Notes only under the following circumstances: (1) during any calendar quarter (and only during such calendar quarter) commencing after the calendar quarter ending on December 31, 2021, if the Last Reported Sale Price (as defined in the indenture for the Notes) per share of Common Stock (as defined in the indenture for the Notes) exceeds one hundred and thirty percent (130%) of the Conversion Price (as defined in the indenture for the Notes) for each of at least twenty (20) Trading Days (as defined in the indenture for the notes) (whether or not consecutive) during the thirty (30) consecutive Trading Days ending on, and including, the last Trading Day of the immediately preceding calendar quarter; (2) during the five (5) consecutive Business Days (as defined in the indenture for the Notes) immediately after any ten (10) consecutive Trading Day period (such ten (10) consecutive Trading Day period, the “Measurement Period”) if the Trading Price per $1,000 principal amount of Notes for each Trading Day of the Measurement Period was less than ninety eight percent (98%) of the product of the Last Reported Sale Price per share of Common Stock on such Trading Day and the Conversion Rate (as defined in the indenture for the Notes) on such Trading Day; (3) if we call any or all of the Notes for redemption, such Notes called for redemption may be converted any time prior to the close of business on the second business day immediately before the redemption date; or (4) upon the occurrence of specified corporate events. From and after July 1, 2026, noteholders may convert their Notes at any time at their election until the close of business on the second scheduled trading day immediately before the maturity date. We will settle conversions by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election. The initial conversion rate for the Notes is 13.6783 shares of common stock per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $73.11 per share of common stock. The conversion rate and conversion price will be subject to adjustment upon the occurrence of certain events, such as distribution of stock dividends or stock splits. We may not redeem the Notes prior to October 7, 2024. The Notes will be redeemable, in whole or in part (subject to certain limitations), for cash at our option at any time, and from time to time, on or after October 7, 2024 and on or before the 25th scheduled trading day immediately before the maturity date, but only if the last reported sale price per share of our common stock exceeds 130% of the conversion price on (i) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date we send the related redemption notice; and (ii) the trading day immediately before the date we send such notice. The redemption price will be a cash amount equal to the principal amount of the Notes to be redeemed, plus accrued and unpaid interest, if any, up to, but excluding, the redemption date. Pursuant to the Partial Redemption Limitation (as defined in the indenture for the Notes), we may not elect to redeem less than all of the outstanding Notes unless at least $150.0 million aggregate principal amount of Notes are outstanding and not subject to redemption as of the time we send the related redemption notice. If a “fundamental change” (as defined in the indenture for the Notes) occurs, then, subject to a limited exception, noteholders may require us to repurchase their Notes for cash. The repurchase price will be equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, up to, but excluding, the applicable repurchase date. In accounting for the issuance of the Notes, we recorded the Notes as a liability at face value. The effective interest rate for the Notes was 0.84%. Transaction costs of $10.0 million, attributable to the issuance of the Notes were recorded as a direct deduction from the related debt liability in the Consolidated Balance Sheet and are amortized to interest expense over the term of the Notes. The net carrying amount of the Notes consists of the following:
(in thousands) |  | March 31, 2023 |  |  | December 31, 2022 |
Principal balance |  | $ | 345,000 |  |  | $ | 345,000 |
Unamortized issuance costs |  | $ | (7,011 | ) |  | $ | (7,503 | )
Carrying value, net |  | $ | 337,989 |  |  | $ | 337,497 |
9. Debt (continued) The total interest expense recognized related to the Notes consists of the following:
|  | Three months ended March 31, |
(in thousands) |  | 2023 |  |  | 2022 |
Contractual interest expense |  | $ | 216 |  |  | $ | 221 |
Amortization of issuance costs |  |  | 493 |  |  |  | 488 |
Total |  | $ | 709 |  |  | $ | 709 |
Debt fees Lender fees that were paid upfront to the lenders and debt issuance fees paid to third parties are recorded as a discount to the carrying amount of debt and are being amortized to interest expense over the life of the debt. 2021 Capped Call Transactions In connection with the pricing of the Notes, we used $35.6 million of the net proceeds from the Notes to enter into privately negotiated capped call transactions (the “Capped Call Transactions”) with certain financial institutions. The Capped Call Transactions are generally expected to reduce potential dilution to holders of our common stock upon any conversion of the Notes and/or offset any cash payments we are required to make in excess of the principal amount of the Notes upon conversion of the Notes in the event that the market price per share of our common stock is greater than the strike price of the Capped Call Transactions with such reduction and/or offset subject to a cap. The Capped Call Transactions have an initial cap price of approximately $106.34 per share, which represents a premium of 100% over the last reported sale prices of our common stock of $53.17 per share on September 9, 2021, and is subject to certain adjustments under the terms of the Capped Call Transactions. Collectively, the Capped Call Transactions cover, initially, the number of shares of our common stock underlying the Notes, subject to anti-dilution adjustments substantially similar to those applicable to the Notes. The Capped Call Transactions do not meet the criteria for separate accounting as a derivative as they are indexed to our stock. The premiums paid for the Capped Call Transaction have been included as a net reduction to additional paid-in capital within stockholders’ equity.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI https://asc.fasb.org/topic&trid=2208564 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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