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Debt Debt | 6 Months Ended
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Jun. 30, 2018
Debt [Abstract] |
Debt Disclosure [Text Block] | Debt 0.75% Senior Convertible Notes due 2022
(in millions) | June 30, 2018 |  | December 31, 2017
0.75% Senior convertible notes due 2022: |  |  |
Principal amount | $ | 400.0 |  |  | $ | 400.0 |
Unamortized debt discount | (57.8 | ) |  | (64.4 | )
Unamortized debt issuance costs | (7.2 | ) |  | (8.0 | )
Net carrying amount of senior convertible notes | $ | 335.0 |  |  | $ | 327.6 |
Fair value of outstanding notes | $ | 465.8 |  |  | $ | 381.3 |
Amount by which the notes' if-converted value exceeds their principal amount | $ | 55.4 |  |  | $ | — |
In May 2017, we completed an offering of $350.0 million aggregate principal amount of 0.75% convertible senior notes due 2022 (the "2022 Notes") and, in June 2017 the initial purchasers exercised their option to purchase an additional $50.0 million aggregate principal amount of 2022 Notes. The 2022 Notes have a stated interest rate of 0.75% and a maturity date of May 15, 2022. The net proceeds from the offering, after deducting initial purchasers' discounts and costs directly related to the offering, were approximately $389.0 million. The 2022 Notes may be settled in cash, stock, or a combination thereof, solely at our discretion. The initial conversion rate of the 2022 Notes is 10.0918 shares per $1,000 principal amount, which is equivalent to a conversion price of approximately $99.09 per share, subject to adjustments. We use the if-converted method for assumed conversion of the 2022 Notes to compute the weighted average shares of common stock outstanding for diluted earnings per share. As 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, which resulted in recognizing $72.6 million in additional paid-in-capital during 2017. The interest expense recognized on the 2022 Notes during the three months ended June 30, 2018 includes $0.7 million, $3.3 million and $0.4 million for the contractual coupon interest, the accretion of the debt discount and the amortization of the debt issuance costs, respectively. The interest expense recognized on the 2022 Notes during the six months ended June 30, 2018 includes $1.5 million, $6.6 million and $0.8 million for the contractual coupon interest, the accretion of the debt discount and the amortization of the debt issuance costs, respectively. The interest expense recognized on the 2022 Notes during the three and six months ended June 30, 2017 includes $0.4 million, $1.8 million and $0.2 million for the contractual coupon interest, the accretion of the debt discount and the amortization of the debt issuance costs, respectively. The effective interest rate on the 2022 Notes is 5.1%, which includes the interest on the notes, amortization of the debt discount and debt issuance costs. The discount on the 2022 Notes is amortized through May 15, 2022. Interest on the 2022 Notes began accruing upon issuance and is payable semi-annually on May 15 and November 15 of each year. Holders of the 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. Additionally, in the event of a fundamental change (as defined in the Indenture), holders of the Notes may require us to repurchase all or a portion of their Notes at a price equal to 100% of the principal amount of Notes, plus any accrued and unpaid interest, including any additional interest, to, but excluding, the repurchase date. Holders of the 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 February 15, 2022, in multiples of $1,000 principal amount, only under the following circumstances:
• | during any calendar quarter commencing after September 30, 2017 (and only during such calendar quarter), if the last reported sale price of 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;
• | 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 common stock and the applicable conversion rate of the Notes on such trading day;
• | if we call any or all of the Notes for redemption, at any time prior to the close on business on the scheduled trading day immediately preceding the redemption date; or
• | upon the occurrence of specified corporate transactions.
On or after February 15, 2022, until 5:00 p.m., New York City time, on the business day immediately preceding the maturity date, holders of the Notes may convert all or a portion of their Notes regardless of the foregoing circumstances. The redemption price will be equal to 100% of the principal amount of such 2022 Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date. No principal payments are due on the 2022 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 includes customary terms and covenants, including certain events of default after which the Notes may be due and payable immediately. We are unaware of any current events or market conditions that would allow holders to convert the 2022 Notes as of June 30, 2018. Revolving Credit Agreement In June 2016, we entered into a $200.0 million revolving credit agreement (the “Credit Agreement”), as amended in May 2017, with JPMorgan Chase Bank, NA, as administrative agent, Bank of America, Silicon Valley Bank, Union Bank and Bank of the West. In addition to allowing borrowings in US dollars, the Credit Agreement provides a $25.0 million sublimit for borrowings in Canadian Dollars, Euros, British Pounds, Swedish Krona, Japanese Yen and any other currency that is subsequently approved by JPMorgan Chase and each lender. The Credit Agreement also provides a sub-facility of up to $10.0 million for letters of credit, of which $5.6 million is still available. The interest rate under the Credit Agreement ranges from 0.75% to 2.75% plus our choice of one of two base rates, LIBOR or a rate based on the publicly announced JPMorgan Chase prime rate, the federal funds rate or the overnight bank funding rate. We will also pay a commitment fee of between 0.25% and 0.45%, payable quarterly in arrears, on the average daily unused amount of the revolving facility based on our leverage ratio. The aggregate debt issuance costs and fees incurred with respect to entering into the Credit Agreement were $0.7 million, which have been capitalized on our Consolidated Balance Sheet within “Other Assets” and will be amortized through the maturity date of June 2021 on a straight line basis. Our obligations under the 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). Short-term borrowings In March 2017 we drew $75.0 million on the Credit Agreement under a six month term. We repaid the entire principal balance in May 2017. As of June 30, 2018 we had no outstanding borrowings under the Credit Agreement, and $195.6 million under the Credit Agreement remains available, which is reduced by outstanding letters of credit.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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