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Debt
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Debt
5. Debt
Senior Convertible Notes
The carrying amounts of our senior convertible notes were as follows as of the dates indicated:
December 31,
(Dollars in millions)20212020
Principal amount:
Senior Convertible Notes due 2023$792.3 $850.0 
Senior Convertible Notes due 20251,207.5 1,207.5 
Total principal amount1,999.8 2,057.5 
Unamortized debt discount(282.7)(371.1)
Unamortized debt issuance costs(14.4)(19.2)
Carrying amount of liability component$1,702.7 $1,667.2 
Carrying value of equity component$449.4 $461.0 
Remaining amortization period of debt discount on the liability component:
Senior Convertible Notes due 20231.9 years2.9 years
Senior Convertible Notes due 20253.9 years4.9 years
For our senior convertible notes for which the if-converted value exceeded the principal amount, the amount in excess of principal is as follows as of the dates indicated:
December 31,
(In millions)20212020
Senior Convertible Notes due 2023$1,797.3 $1,077.5 
Senior Convertible Notes due 2025141.8 — 
Total by which the notes’ if-converted value exceeds their principal amount$1,939.1 $1,077.5 
The following table summarizes the components of interest expense and the effective interest rates for each of our senior convertible notes for the periods shown.
Twelve Months Ended
December 31,
(Dollars in millions)202120202019
Cash interest expense:
Contractual coupon interest (1)(2)
$9.3 $9.3 $9.3 
Non-cash interest expense:
Accretion of debt discount83.0 68.6 45.8 
Amortization of debt issuance costs4.4 4.0 3.7 
Total interest expense recognized on senior notes$96.7 $81.9 $58.8 
Effective interest rates:
Senior Convertible Notes due 2022 (2)
*5.1 %5.1 %
Senior Convertible Notes due 20235.6 %5.6 %5.6 %
Senior Convertible Notes due 20255.5 %5.5 %*
(1) Interest on the 2022 Notes began accruing upon issuance and was payable semi-annually on May 15 and November 15 of each year. Interest on the 2023 Notes began accruing upon issuance and is payable semi-annually on June 1 and December 1 of each year. Interest on the 2025 Notes began accruing upon issuance and is payable semi-annually on May 15 and November 15 of each year.
(2) The effective interest rate presented represents the rate applicable for the period outstanding. Our $400.0 million aggregate principal amount of unsecured senior convertible notes issued in June 2017 with a stated interest rate of 0.75% and maturity date of May 15, 2022 (the 2022 Notes) were repurchased and converted by August 2020.
* Not applicable as no notes were outstanding at this date.
Repurchase, Conversion, and Redemption of 2022 Notes
In May 2020, we used approximately $282.6 million of the net proceeds from the 2025 Notes offering described below and issued 1,953,067 shares of Dexcom common stock to repurchase $260.0 million principal amount outstanding of the 2022 Notes and the associated conversion feature of the repurchased notes (which was recorded in additional paid-in capital). Holders of $140.0 million in aggregate principal amount of the 2022 Notes elected conversion at their option during the twelve months ended December 31, 2020. We settled these conversions by issuing 1,412,497 shares of our common stock.
As a result of the repurchase and conversions of the 2022 Notes, we recorded a loss on extinguishment of debt of $5.9 million for the twelve months ended December 31, 2020. The loss on extinguishment of debt included the unamortized debt issuance costs for the 2022 Notes.
0.75% Senior Convertible Notes due 2023
In November 2018, we completed an offering of $850.0 million aggregate principal amount of unsecured senior convertible notes with a stated interest rate of 0.75% and a maturity date of December 1, 2023 (the 2023 Notes). The net proceeds from the offering, after deducting initial purchasers’ discounts and costs directly related to the offering, were approximately $836.6 million. The initial conversion rate of the 2023 Notes is 6.0869 shares per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $164.29 per share, subject to adjustments. We entered into transactions for a convertible note hedge (the 2023 Note Hedge) and warrants (the 2023 Warrants) concurrently with the issuance of the 2023 Notes. The 2023 Notes may be settled in cash, stock, or a combination thereof, solely at our discretion. We use the if-converted method for assumed conversion of the 2023 Notes to compute the weighted average shares of common stock outstanding for diluted earnings per share.
No principal payments are due on the 2023 Notes prior to maturity. Other than restrictions relating to certain fundamental changes and consolidations, mergers or asset sales and customary anti-dilution adjustments, the indenture relating to the 2023 Notes includes customary terms and covenants, including certain events of default after which the 2023 Notes may be due and payable immediately.
Since upon conversion by the holders we may elect to settle such conversion in shares of our common stock, cash, or a combination thereof, we accounted for the cash conversion option as an equity instrument classified to stockholders’ equity. As a result, we recognized $171.6 million in additional paid-in capital, net of debt issuance costs, during 2018.
Holders of $57.7 million in aggregate principal amount of the 2023 Notes elected conversion at their option during the twelve months ended December 31, 2021. We settled these conversions by issuing a combination of common stock and treasury stock. We issued 350,778 shares to settle the converted 2023 Notes during the twelve months ended December 31, 2021, of which 198,647 shares were issued out of treasury stock. As a result of the elected conversions, we recorded a loss on extinguishment of debt of $1.4 million. We received 241,845 shares of common stock from the exercise of a portion of the 2023 Note Hedge that we purchased concurrently with the issuance of the 2023 Notes, as described below.
Conversion Rights at the Option of the Holders
Holders of the 2023 Notes have the right to require us to repurchase for cash all or a portion of their notes at 100% of their principal amount, plus any accrued and unpaid interest, upon the occurrence of a fundamental change (as defined in the indenture relating to the notes). We will also be required to increase the conversion rate for holders who convert their 2023 Notes in connection with certain fundamental changes occurring prior to the maturity date or following the delivery by Dexcom of a notice of redemption.
Holders of the 2023 Notes may convert all or a portion of their notes at their option prior to 5:00 p.m., New York City time, on the business day immediately preceding September 1, 2023, in multiples of $1,000 principal amount, only under the following circumstances:
(1)during any calendar quarter commencing after March 31, 2019 (and only during such calendar quarter), if the last reported sale price of Dexcom’s 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 applicable conversion price of the 2023 Notes on each such trading day;
(2)during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the 2023 Notes for each day of that five-day consecutive trading day period was less than 98% of the product of the last reported sale price of Dexcom’s common stock and the applicable conversion rate of the 2023 Notes on such trading day;
(3)if we call any or all of the 2023 Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or
(4)upon the occurrence of specified corporate transactions.
On or after September 1, 2023, until 5:00 p.m., New York City time, on the second scheduled trading day immediately preceding the maturity date, holders of the 2023 Notes may convert all or a portion of their notes regardless of the foregoing circumstances.
Circumstance (1) listed above occurred during the quarters ended December 31, 2020, March 31, 2021, June 30, 2021, and September 30, 2021. As a result, the 2023 Notes were convertible at the option of the holder from January 1, 2021 through December 31, 2021. Circumstance (1) listed above also occurred during the quarter ended December 31, 2021 and as a result, the 2023 Notes will remain convertible at the option of the holder from January 1, 2022 through March 31, 2022. See above for a description of conversion activity related to the 2023 Notes.
Conversion Rights at Our Option
Dexcom may not redeem the 2023 Notes prior to December 1, 2021. On or after December 1, 2021 and prior to September 1, 2023, Dexcom may redeem for cash all or part of the 2023 Notes, at its option, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 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 Dexcom provides notice of redemption. The redemption price will be equal to 100% of the principal amount of the 2023 Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.
2023 Note Hedge
In connection with the offering of the 2023 Notes, in November 2018 we entered into convertible note hedge transactions with two of the initial purchasers of the 2023 Notes (the 2023 Counterparties) entitling us to purchase up to 5.2 million shares of our common stock at an initial price of $164.29 per share, each of which is subject to adjustment. The cost of the 2023 Note Hedge was $218.9 million and we accounted for it as an equity instrument by recognizing $218.9 million in additional paid-in capital during 2018. The 2023 Note Hedge will expire on December 1, 2023. The 2023 Note Hedge is expected to reduce the potential equity dilution upon any conversion of the 2023 Notes and/or offset any cash payments we are required to make in excess of the principal amount of converted 2023 Notes if the daily volume-weighted average price per share of our common stock exceeds the strike price of the 2023 Note Hedge. The strike price of the 2023 Note Hedge initially corresponds to the conversion price of the 2023 Notes and is subject to certain adjustments under the terms of the 2023 Note Hedge. An assumed exercise of the 2023 Note Hedge by us is considered anti-dilutive since the effect of the inclusion would always be anti-dilutive
with respect to the calculation of diluted earnings per share. See above for a description of conversion activity related to the 2023 Notes and shares received as the result of exercising a portion of the 2023 Note Hedge.
2023 Warrants
In November 2018, we also sold warrants to the 2023 Counterparties to acquire up to 5.2 million shares of our common stock. The 2023 Warrants require net share settlement and a pro rated number of warrants will expire on each of the 60 scheduled trading days starting on March 1, 2024. We received $183.8 million in cash proceeds from the sale of the 2023 Warrants, which we recorded in additional paid-in capital during 2018. The 2023 Warrants could have a dilutive effect on our earnings per share to the extent that the price of our common stock during a given measurement period exceeds the strike price of the 2023 Warrants. The strike price of the 2023 Warrants is initially $198.38 per share and is subject to certain adjustments under the terms of the warrant agreements. We use the treasury share method for assumed conversion of the 2023 Warrants when computing the weighted average common shares outstanding for diluted earnings per share.
0.25% Senior Convertible Notes due 2025
In May 2020, we completed an offering of $1.21 billion aggregate principal amount of unsecured senior convertible notes with a stated interest rate of 0.25% and a maturity date of November 15, 2025 (the 2025 Notes). The net proceeds from the offering, after deducting initial purchasers’ discounts and estimated costs directly related to the offering, were approximately $1.19 billion. The initial conversion rate of the 2025 Notes is 1.6655 shares per $1,000 principal amount of notes, which is equivalent to a conversion price of approximately $600.42 per share, subject to adjustments, with a maximum conversion rate of 2.3732. The 2025 Notes may be settled in cash, stock, or a combination thereof, solely at our discretion. We use the if-converted method for assumed conversion of the 2025 Notes to compute the weighted average shares of common stock outstanding for diluted earnings per share.
No principal payments are due on the 2025 Notes prior to maturity. Other than restrictions relating to certain fundamental changes and consolidations, mergers or asset sales and customary anti-dilution adjustments, the indenture relating to the 2025 Notes includes customary terms and covenants, including certain events of default after which the 2025 Notes may be due and payable immediately.
Since upon conversion by the holders we may elect to settle such conversion in shares of our common stock, cash, or a combination thereof, we accounted for the cash conversion option as an equity instrument classified to stockholders’ equity. As a result, we recognized $289.4 million in additional paid-in-capital, net of debt issuance costs, during 2020.
Conversion Rights at the Option of the Holders
In the event of a fundamental change (as defined in the indenture related to the 2025 Notes), holders of the 2025 Notes have the right to require us to repurchase for cash all or a portion of their notes at a price equal to 100% of the principal amount of the 2025 Notes, plus any accrued and unpaid interest. Holders of the 2025 Notes who convert their notes in connection with a make-whole fundamental change (as defined in the indenture) or following the delivery by Dexcom of a notice of redemption are, under certain circumstances, entitled to an increase in the conversion rate.
Prior to 5:00 p.m., New York City time, on the business day immediately preceding August 15, 2025, holders of the 2025 Notes may convert all or a portion of their notes, in multiples of $1,000 principal amount, only under the following circumstances:
(1)during any calendar quarter commencing after September 30, 2020 (and only during such calendar quarter), if the last reported sale price of Dexcom’s 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 applicable conversion price of the Notes on each such trading day;
(2)during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the Notes for each day of that five day consecutive trading day period was less than 98% of the product of the last reported sale price of Dexcom’s common stock and the applicable conversion rate of the Notes on such trading day;
(3)if we call any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or
(4)upon the occurrence of specified corporate transactions.
 On or after August 15, 2025, until 5:00 p.m., New York City time, on the business day immediately preceding the maturity date, holders of the 2025 Notes may convert all or a portion of their notes regardless of the foregoing circumstances.
Conversion Rights at Our Option
Dexcom may not redeem the 2025 Notes prior to May 20, 2023. On or after May 20, 2023 and prior to August 15, 2025, Dexcom may redeem for cash all or part of the 2025 Notes, at its option, if the last reported sale price of our common stock has been at least 130% of the conversion price then in effect for at least 20 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 Dexcom provides notice of redemption. The redemption price will be equal to 100% of the principal amount of the 2025 Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.
Revolving Credit Agreement
Terms of the Revolving Credit Agreement
In October 2021, we entered into a Second Amended and Restated Credit Agreement (the Amended Credit Agreement), which amended and restated the credit agreement we had previously entered into in December 2018 and amended in May 2020 (the Credit Agreement). The Amended Credit Agreement is a five-year revolving credit facility that provides for an available principal amount of $200.0 million, which can be increased up to $500.0 million at our option subject to customary conditions and approval of our lenders. The Amended Credit Agreement will mature on October 13, 2026. Borrowings under the Amended Credit Agreement are available for general corporate purposes, including working capital and capital expenditures.
Information related to availability and outstanding borrowings on our Amended Credit Agreement is as follows as of the date indicated:
December 31,
(In millions)2021
Available principal amount $200.0 
Letters of credit sub-facility25.0 
Outstanding borrowings — 
Outstanding letters of credit7.3 
Total available balance$192.7 
Revolving loans under the Amended Credit Agreement bear interest at our choice of one of three base rates plus a range of applicable rates that are based on our leverage ratio. The first base rate is the Alternate Base Rate (“ABR”) and loans comprising each ABR borrowing shall bear interest at the ABR plus the applicable rate between 0.375% to 1.000%. The ABR is the highest of (a) the prime rate last quoted by The Wall Street Journal, (b) the Federal Reserve Bank of New York (“NYFRB”) rate plus one half of 1%, and (c) the Adjusted London Interbank Offered Rate (“LIBO Rate”) for a one month interest period plus 1%. The second base rate is the Term Benchmark rate and loans comprising each Term Benchmark borrowing shall bear interest at the Adjusted LIBO Rate, the Adjusted Euro Interbank Offered Rate (“EURIBOR Rate”), the Adjusted Stockholm Interbank Offered Rate (“STIBOR Rate”), the Adjusted Canadian Dollar Offered Rate (“CDOR”), Adjusted Australian Dollar (“AUD”) Rate, the Adjusted Bank Bill Benchmark Rate (“BKBM Rate”) or the Adjusted Tokyo Interbank Offered Rate (“TIBOR Rate”), as applicable based on the currency denomination borrowed, plus the applicable rate between 1.375% to 2.000% . The third base rate is the Daily Simple RepoFunds Rate (“RFR”) and loans comprising each Daily Simple RFR Loan shall bear interest at a rate per annum equal to the applicable Daily Simple RFR plus the applicable rate between 1.375% to 2.000% plus an additional 0.0326%. We will also pay a commitment fee of between 0.175% and 0.250%, payable quarterly in arrears, on the average daily unused amount of the revolving facility based on our leverage ratio.
Our obligations under the Amended Credit Agreement are guaranteed by our existing and future wholly-owned domestic subsidiaries, and are secured by a first-priority security interest in substantially all of the assets of Dexcom and the guarantors, including all or a portion of the equity interests of our domestic subsidiaries and first-tier foreign subsidiaries but excluding real property and intellectual property (which is subject to a negative pledge). The Amended Credit Agreement contains covenants that limit certain indebtedness, liens, investments, transactions with affiliates, dividends and other restricted payments, subordinated indebtedness and amendments to subordinated indebtedness documents, and sale and leaseback transactions of Dexcom or any of its domestic subsidiaries. The Amended Credit Agreement also requires us to maintain a maximum leverage ratio and a minimum fixed charge coverage ratio. We were in compliance with these covenants as of December 31, 2021.