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Note 12 - Convertible Senior Notes

3 Months Ended

Mar. 31, 2025

Note 12. Convertible Senior Notes

On March 5, 2019, the Company issued $80.5 million of 5% convertible senior notes due 2024 (the “2024 Notes”). On December 5, 2023, the Company issued approximately $80.2 million aggregate principal amount of 5.250% convertible senior notes due 2026 (the "2026 Notes"), and on the same day consummated various separate, privately negotiated exchange agreements with certain holders of its 2024 Notes to exchange or repurchase approximately $80.2 million principal amount of the 2024 Notes for aggregate consideration consisting of approximately $81.1 million in cash, which included accrued interest on the 2024 Notes, and approximately 466,368 shares of the Company's common stock, par value $0.001 per share. The Company paid off the remaining $0.29 million of the 2024 Notes on March 15, 2024.

The 2026 Notes bear interest at a rate of 5.250% per year and pay interest semi-annually in arrears on June 15 and December 15 of each year, beginning on June 15, 2024. The 2026 Notes mature on December 15, 2026, unless earlier converted, redeemed or repurchased in accordance with their terms.

On December 18, 2024, the Company entered into exchange agreements with certain holders of the 2026 Notes to exchange approximately $76.7 million principal amount of the 2026 Notes for aggregate consideration consisting of (i) $125.0 million aggregate principal amount of 2.75% Convertible Senior Notes due 2030 (the “2030 Notes”), (ii) 1,487,874 shares of the Company’s common stock, par value $0.001 per share (the "Common Stock") and (iii) approximately $89.6 thousands of cash in aggregate, representing accrued and unpaid interest on the 2026 Notes and the value of fractional shares of Common Stock (such transactions, collectively, the "Exchanges"). There was $3.5 million principal amount for the 2026 Notes remaining. The Exchanges closed on December 23, 2024.

The 2030 Notes were issued pursuant to an Indenture, dated as of December 23, 2024 (the "Indenture"), between the Company, as issuer, and Computershare Trust Company, N.A., as trustee. The 2030 Notes bear interest at a rate of 2.750% per year and will pay interest semiannually in arrears on January 15 and July 15 of each year, beginning on July 15, 2025. The 2030 Notes will mature on January 15, 2030, unless earlier converted, redeemed or repurchased in accordance with their terms.

The following table presents the carrying value of the 2026 Notes and the 2030 Notes for the periods indicated (in thousands):

	*March 31,*			*December 31,*
	*2025*			*2024*
2026 Notes
Principal	$	3,500		$	3,500
Unamortized debt issuance costs		—			(83	)
Net carrying amount		3,500			3,417
2030 Notes
Principal		125,000			125,000
Premium upon issuance		9,908			10,416
Unamortized debt issuance costs		(4,179	)		(4,336	)
Net carrying amount		130,729			131,080
Total net carrying amount	$	134,229		$	134,497

The conversion rate for the 2030 Notes is 23.0884 shares of Common Stock per $1,000 principal amount of the 2030 Notes (which is equivalent to a conversion price of approximately $43.31 per share of Common Stock, representing a premium of approximately 27.50% over the last reported sale price of the Common Stock on December 18, 2024 of $33.97 per share), subject to adjustment. Before October 15, 2029, holders of the 2030 Notes will have the right to convert their 2030 Notes only upon the satisfaction of a common stock sale price condition or a note trading price condition (each, as described in the Indenture) or upon the occurrence of certain events (including the occurrence of a Fundamental Change, Make-Whole Fundamental Change or Common Stock Change Event (each as defined in the Indenture). From and after October 15, 2029, holders of the 2030 Notes may convert their 2030 Notes at any time at their election until the close of business on the second scheduled trading day immediately before the maturity date. The Company will settle conversions by paying or delivering, as applicable, cash, shares of its Common Stock or a combination of cash and shares of its Common Stock, at the Company’s election, based on the applicable conversion rate(s).

The 2030 Notes will be redeemable, in whole or in part (subject to certain limitations described in the Indenture), at the Company’s option at any time, and from time to time, on or after January 15, 2027 and on or before the 40th scheduled trading day immediately before the maturity date, at a cash redemption price equal to the principal amount of the 2030 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, but only if the last reported sale price per share of the Common Stock exceeds 130% of the conversion price on (1) 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 the Company sends the related redemption notice; and (2) the trading day immediately before the date it sends such notice.

In addition, the 2030 Notes will be redeemable, in whole or in part, at the Company’s option at any time, and from time to time, on or before the 40th scheduled trading day immediately before the maturity date, at a cash redemption price equal to the principal amount of the 2030 Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date (subject to the right of a holder of 2030 Notes as of the close of business on a record date to receive the related interest payment on the corresponding interest payment date), if the “Specified Divestiture” (as defined in the Indenture) is completed.

Calling any 2030 Note for redemption will constitute a “Make-Whole Fundamental Change” (as defined in the Indenture) with respect to that 2030 Note, in which case the conversion rate applicable to the conversion of that 2030 Note will be increased in certain circumstances if it is converted after it is called for redemption.

In addition, if the Specified Divestiture is completed, then unless the Company has previously elected to redeem all of the 2030 Notes, each holder of 2030 Notes will have the right to require the Company to repurchase its 2030 Notes for cash on a date of the Company’s choosing, which must be a business day that is no more than 35, nor less than 20, business days after the date the Company’s sends the related notice of Specified Divestiture. The repurchase price for a note tendered for such repurchase will be equal to the principal amount of the 2030 Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the repurchase date (subject to the right of a holder of 2030 Notes as of the close of business on a record date to receive the related interest payment on the corresponding interest payment date).

Moreover, if the Company undergoes a fundamental change, as described in the Indenture, holders of the 2030 Notes may require the Company to repurchase for cash all or part of their 2030 Notes at a repurchase price equal to 100% of the principal amount of the 2030 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the required repurchase date.

Additionally, the 2030 Notes are subject to customary events of default. The 2030 Notes do not restrict the Company’s ability to incur debt or liens. No sinking fund is provided for the 2030 Notes. There are no guarantors of the 2030 Notes.

Pursuant to the guidance in ASC 815-40, Contracts in Entity’s Own Equity, the Company evaluated whether the conversion feature of the note needed to be bifurcated from the host instrument as a freestanding financial instrument. Under ASC 815-40, to qualify for equity classification (or non-bifurcation, if embedded) the instrument (or embedded feature) must be both (1) indexed to the issuer’s own stock and (2) meet the requirements of the equity classification guidance. Based upon the Company’s analysis, it was determined the conversion option is indexed to its own stock and also met all the criteria for equity classification. Accordingly, the conversion option is not required to be bifurcated from the host instrument as a derivative.

Pursuant to ASC 815-15, the Company further determined that the contingent redemption features in the 2030 Notes are not required to be bifurcated from the host contract and accounted for separately. Additionally, the Company then evaluated whether the conversion feature needed to be separately accounted for as an equity component under ASC 470-20, Debt with Conversion and Other Options, and determined that the additional premium was not substantial. Accordingly, that amount was recognized as a premium on the 2030 Notes.

The following table sets forth interest expense information related to the 2026 Notes and 2030 Notes (in thousands):

	*Three months ended March 31,*
	*2025*			*2024*
Contractual interest expense	$	397		$	1,059
Amortization of debt issuance costs		296			350
Total interest cost	$	693		$	1,409
Effective interest rate		1.0	%		5.3	%