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 2026 Notes were issued pursuant to an Indenture, dated as of December 5, 2023, (the "Indenture"), between the Company and Computershare Trust Company, N.A., as trustee. The 2026 Notes will bear interest at a rate of 5.250% per year and will pay interest semi-annually in arrears on June 15 and December 15 of each year, beginning on June 15, 2024. The 2026 Notes will mature on December 15, 2026, unless earlier converted, redeemed or repurchased in accordance with their terms.

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

The conversion rate for the 2026 Notes is 65.6276 shares of the Company’s common stock per $1,000 principal amount of the 2026 Notes (which is equivalent to a conversion price of approximately $15.24 per share of the Company’s common stock, representing a premium of approximately 15% over the last reported sale price of the Company’s common stock on November 30, 2023 of $13.25 per share), subject to adjustment. Before September 15, 2026, holders of the 2026 Notes will have the right to convert their 2026 Notes only upon the occurrence of certain events. From and after September 15, 2026, holders of the 2026 Notes may convert their 2026 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).

Initially there are no guarantors of the 2026 Notes, but the 2026 Notes will be fully and unconditionally guaranteed, on a senior, unsecured basis by certain of the Company’s future domestic subsidiaries. The 2026 Notes are the Company’s senior, unsecured obligations and are equal in right of payment with existing and future senior, unsecured indebtedness, senior in right of payment to the Company’s existing and future indebtedness that is expressly subordinated to the 2026 Notes and effectively subordinated to the Company’s existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness. The Note Guarantee (as defined in the Indenture) of each future guarantor, if any, will be such guarantor’s senior, unsecured obligations and is equal in right of payment with existing and future senior, unsecured indebtedness, senior in right of payment to such future guarantor’s existing and future indebtedness that is expressly subordinated to the 2026 Notes and effectively subordinated to such future guarantor’s existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness.

The 2026 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 December 15, 2024 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 2026 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 Company’s 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 2026 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 2026 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 2026 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 Company completes the "Specified Divestiture" of (x) one or more of its manufacturing facilities located in the People’s Republic of China and/or (y) significant assets located in the People’s Republic of China which relate to the Company’s transceiver business and multi-channel optical sub-assembly products (or any substantially related assets), for aggregate consideration in cash to the Company of not less than the U.S. Dollar equivalent of $150,000,000 (measured at the time of completion).

Calling any Convertible Note for redemption will constitute a “Make-whole fundamental change” (as defined in the Indenture) with respect to that Convertible Note, in which case the conversion rate applicable to the conversion of that Convertible 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 each holder of 2026 Notes will have the right to require the Company to repurchase its 2026 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 we send 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 2026 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 2026 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 2026 Notes may require the Company to repurchase for cash all or part of their 2026 Notes at a repurchase price equal to 100% of the principal amount of the 2026 Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the required repurchase date.

Additionally, the 2026 Notes are subject to customary events of default. No sinking fund is provided for the 2026 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 contained in ASC 815-40-25-7 and 815-40-25-10. Accordingly, the conversion option is not required to be bifurcated from the host instrument as a freestanding financial instrument. Since the conversion feature meets the equity scope exception from derivative accounting, 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. The Company determined that notes should be accounted for in their entirety as a liability.

The following table sets forth interest expense information related to the 2024 Notes (in thousands):