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Convertible Senior Notes | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Convertible Senior Notes | Convertible Senior Notes In August 2019, we issued $345.0 million aggregate principal amount of 1.125% convertible senior notes due 2026 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended, including the exercise in full by the initial purchasers of their option to purchase an additional $45.0 million principal amount (the “Notes”). The Notes were issued pursuant to an indenture and are senior, unsecured obligations of the Company. The Notes bear interest at a fixed rate of 1.125% per annum, payable semi-annually in arrears on February 15 and August 15 of each year, commencing on February 15, 2020. Proceeds from the issuance of the Notes totaled $335.9 million, net of initial purchaser discounts and issuance costs. The initial conversion rate is 12.4756 shares of our common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $80.16 per share, subject to adjustment upon the occurrence of specified events. Holders of the Notes may convert all or a portion of their Notes prior to the close of business on May 15, 2026, in multiples of $1,000 principal amount, only under the following circumstances: •during any calendar quarter commencing after the calendar quarter ending on September 30, 2019 (and only during such calendar quarter), if the last reported sale price of our Class A common stock, par value $0.001 per share (which we refer to in this offering memorandum as our “Class A common stock”), for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; •during the five consecutive business day period immediately following any ten consecutive trading day period (the “measurement period”) in which the trading price (as defined below) per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our Class A common stock and the conversion rate on each such trading day; •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 •upon the occurrence of certain specified corporate events as set forth in the indenture. On or after May 16, 2026, holders of the Notes may convert their Notes at any time until the close of business on the second scheduled trading day immediately preceding the maturity date of the Notes. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our Class A common stock or a combination of cash and shares of our Class A common stock, at our election, in the manner and subject to the terms and conditions provided in the indenture. It is our current intent to settle conversions through a combination settlement of cash and shares of our Class A common stock with a specified dollar amount per $1,000 principal amount of Notes of $1,000. The Company may redeem for cash all or any portion of the Notes, at its option, on or after August 21, 2023, if the last reported sale price of the Company’s 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 (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus any accrued and unpaid interest to, but excluding, the redemption date. During the third quarter of 2021 one of the conversion conditions was met and the Notes are now convertible at the option of the holders through December 31, 2021. Specifically, the last reported sale price of our Class A common stock exceeded 130% of the conversion price of the Notes for more than 20 trading days during the 30 consecutive trading days ended September 30, 2021. As a result, the Notes were classified as current liabilities on the condensed consolidated balance sheet as of September 30, 2021. As of September 30, 2021, and through the date of this filing, we have not received any conversion requests for the Notes. Interest expense representing the amortization of the debt discount and issuance costs as well as contractual interest expense is amortized to interest expense at an effective interest rate of 4.3% over the term of the Notes. As of September 30, 2021 the if-converted value of the Notes exceeded the principal amount by $261.7 million. As of September 30, 2021, the remaining life of the Notes is approximately 4.8 years. The net carrying amount of the liability and equity components of the Notes was as follows (in thousands):
| September 30, 2021 |  | December 31, 2020
Liability component: |  |  |
Principal | $ | 345,000 |  |  | $ | 345,000 |
Unamortized discount | (43,255) |  |  | (49,346) |
Unamortized issuance costs | (5,404) |  |  | (6,164) |
Net carrying amount | $ | 296,341 |  |  | $ | 289,490 |
Equity component, net of purchase discounts and issuance costs | $ | 58,560 |  |  | $ | 58,560 |
Interest expense related to the Notes is as follows (in thousands):
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Contractual interest expense | $ | 970 |  |  | $ | 970 |  |  | $ | 2,911 |  |  | $ | 2,910 |
Amortization of debt discount | 2,045 |  |  | 1,983 |  |  | 6,091 |  |  | 5,903 |
Amortization of issuance costs | 256 |  |  | 248 |  |  | 760 |  |  | 738 |
Total interest expense | $ | 3,271 |  |  | $ | 3,201 |  |  | $ | 9,762 |  |  | $ | 9,551 |

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