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Convertible Senior Notes

6 Months Ended

Jun. 30, 2019

0.75% Convertible Notes due 2023

In February 2018, the Company issued $230.0 million principal amount of convertible senior notes due in February 2023. The interest rates for the 2023 Notes are fixed at 0.75% per annum with interest payable semi-annually on February 15 and August 15 of each year, commencing on August 15, 2018. The 2023 Notes mature on February 15, 2023, unless earlier converted or repurchased in accordance with their terms prior to such date. Each $1,000 of principal of the 2023 Notes will initially be convertible into 17.4292 shares of the Company's common stock, which is equivalent to an initial conversion price of approximately $57.38 per share. The initial conversion price for each of the 2023 Notes is subject to adjustment upon the occurrence of certain specified events.

The 2023 Notes are the Company's senior unsecured obligations and rank senior in right of payment to any of the Company's indebtedness that is expressly subordinated in right of payment to the 2023 Notes, rank equally in right of payment with any of the Company's indebtedness that is not so subordinated, are effectively junior in right of payment to any of the Company's secured indebtedness to the extent of the value of the assets securing such indebtedness and are structurally junior to all indebtedness and other liabilities (including trade payables) of the Company's current or future subsidiaries.

On or after November 15, 2022, holders may convert all or any portion of their 2023 Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, regardless of the succeeding conditions described herein. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of its common stock or a combination of cash and shares of its common stock, at its election, as described in the indenture governing the 2023 Notes.

Holders may convert their 2023 Notes at their option at any time prior to the close of business on the business day immediately preceding November 15, 2022 only under the following circumstances:

•

during any calendar quarter commencing after the calendar quarter ending on June 30, 2018 (and only during such calendar quarter), if the last reported sale price of the 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 after any five consecutive trading day period in which the trading price per $1,000 principal amount of 2023 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; or


•	upon the occurrence of specified corporate events.

If a fundamental change (as defined in the relevant indenture governing the 2023 Notes) occurs prior to the maturity date, holders of each of the 2023 Notes may require the Company to repurchase all or a portion of their notes for cash at a repurchase price equal to 100% of the principal amount of the 2023 Notes, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. As of June 30, 2019, the 2023 Notes were not yet convertible.

In accordance with accounting guidance for cash conversion features, the Company valued the liability component at the estimated fair value, as of the date of issuance, of a similar debt without the conversion feature. The effective interest rate for the liability component was 5.875%. The liability component of the 2023 Notes is recorded in long-term debt, and the interest payable within the next twelve months is recorded in accrued liabilities on the condensed consolidated balance sheets as of June 30, 2019. The Company recorded the difference between the initial proceeds of the convertible debt and the fair value of the

conversion feature, and the difference was allocated to additional paid-in capital on the condensed consolidated balance sheet as the carrying amount of the equity component.

In accounting for the transaction costs for the February 2018 convertible note offering, the Company allocated the costs incurred to the liability and equity components in proportion to the allocation of the proceeds from issuance to the liability and equity components. Issuance costs attributable to the liability component, totaling $5.3 million for the 2023 Notes are being amortized to expense over the expected life the 2023 Notes using the effective interest method. Issuance costs attributable to the equity component related to the conversion feature, totaling $1.5 million for the 2023 Notes were netted with the equity component.

The 2023 Notes consist of the following:



	As of June 30, 2019
Liability component:
Principal	$	230,000
Unamortized debt discount	(38,151		)
Unamortized debt issuance costs	(3,993		)
Net carrying amount	187,856

Equity component:
Net allocation of proceeds	31,116
Net issuance costs	(1,517		)
Net carrying amount	$	29,599

The following table sets forth total interest expense recognized related to the 2023 Notes:



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Contractual interest expense	$	431	$	431	$	868	$	647
Amortization of debt issuance costs	250		223		500		346
Amortization of debt discount	2,342		1,990		4,640		3,089
Total	$	3,023	$	2,644	$	6,008	$	4,082

As of June 30, 2019, the remaining period over which the debt discount and debt issuance costs will be amortized was 3.6 years.

Bond Hedges and Warrants Transactions

Concurrent with the February 2018 convertible note offering, the Company entered into separate convertible notes bond hedges, or Bond Hedges, and Warrants transactions. The Bond Hedges are generally expected to reduce potential dilution to the Company's common stock upon conversion of the 2023 Notes. The Bond Hedges are call options that give the Company the option to purchase, subject to anti-dilution adjustments substantially identical to those in the 2023 Notes, approximately 0.9 million shares of its common stock for $57.38 per share, exercisable upon conversion of the 2023 Notes and expires in February 2023. The total cost of the Bond Hedges transactions was $41.7 million.

Under the Warrants transaction, the Company issued warrants to acquire, subject to anti-dilution adjustments, up to approximately 4.0 million shares over 80 scheduled trading days beginning on May 15, 2023 at an exercise price of $78.75 per share. If the Warrants are not exercised on their exercise dates, they will expire. Pursuant to the Warrants, if the average market value per share of the Company's common stock for the reporting period, as measured under the Warrants, exceeds the exercise price of the Warrants of $78.75, the Warrants will have a dilutive effect on the Company's earnings per share, assuming the Company is profitable. The Company received $22.4 million in cash proceeds from the sale of the Warrants.

The Bond Hedges and the Warrants are separate transactions, in each case, entered into by the Company with counterparties, and are not part of the terms of the 2023 Notes and will not affect any holders' rights under the 2023 Notes. The holders of the 2023 Notes will not have any rights with respect to the Bond Hedges or Warrants transactions. The Bond Hedges

and Warrants do not meet the criteria for derivative accounting as they are indexed to the Company's stock. The amounts paid for the Bond Hedges and the proceeds received from the sale of the Warrants have been included as a net reduction to additional paid-in capital.

0.75% Convertible Note due 2026

In June 2019, the Company issued $316.3 million principal amount of convertible senior notes due in June 2026. The interest rates for the 2026 Notes are fixed at 0.75% per annum with interest payable semi-annually on June 1 and December 1 of each year, commencing on December 1, 2019. The 2026 Notes mature on June 1, 2026, unless earlier converted or repurchased in accordance with their terms prior to such date. Each $1,000 of principal of the 2026 Notes will initially be convertible into 11.2851 shares of the Company's common stock, which is equivalent to an initial conversion price of approximately $88.61 per share. The initial conversion price for each of the 2026 Notes is subject to adjustment upon the occurrence of certain specified events.

The 2026 Notes are the Company's senior unsecured obligations and rank senior in right of payment to any of the Company's indebtedness that is expressly subordinated in right of payment to the 2026 Notes, rank equally in right of payment with any of the Company's indebtedness that is not so subordinated, including the 2023 Notes, are effectively junior to any of the Company's secured indebtedness to the extent of the value of the assets securing such indebtedness and are structurally junior to all indebtedness and other liabilities (including trade payables) of the Company's current and future subsidiaries.

On or after June 5, 2023, the Company may redeem for cash all or any portion of the notes, at the Company's option if the last reported sale price of the Company's common stock has been at least 130% of the conversion price in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading-day period. If the Company calls any or all of the 2026 Notes for redemption, holders may convert all or any portion of their 2026 Notes at any time prior to the close of business on the scheduled trading day prior to the redemption date, even if the 2026 Notes are not otherwise convertible at such time. After that time, the right to convert such notes will expire, unless the Company defaults in the payment of the redemption price, in which case a holder of 2026 Notes may convert all or any portion of its 2026 Notes until the redemption price has been paid or duly provided for.

On or after March 1, 2026, holders may convert all or any portion of their 2026 Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the succeeding conditions described herein. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of its common stock or a combination of cash and shares of its common stock, at its election, as described in the indenture governing the 2026 Notes.

Holders may convert their 2026 Notes at their option at any time prior to the close of business on the business day immediately preceding March 1, 2026 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 the 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 after any five consecutive trading day period in which the trading price per $1,000 principal amount of 2026 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; or


•	upon the occurrence of specified corporate events.

If a fundamental change (as defined in the relevant indenture governing the 2026 Notes) occurs prior to the maturity date, holders of each of the 2026 Notes may require the Company to repurchase all or a portion of their notes for cash at a repurchase price equal to 100% of the principal amount of the 2026 Notes, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date. As of June 30, 2019, the 2026 Notes were not yet convertible.

payable within the next twelve months is recorded in accrued liabilities on the condensed consolidated balance sheets as of June 30, 2019. The Company recorded the difference between the initial proceeds of the convertible debt and the fair value of the conversion feature, and the difference was allocated to additional paid-in capital on the condensed consolidated balance sheet as the carrying amount of the equity component.

In accounting for the transaction costs for the June 2019 convertible note offering, the Company allocated the costs incurred to the liability and equity components in proportion to the allocation of the proceeds from issuance to the liability and equity components. Issuance costs attributable to the liability component, totaling $6.4 million for the 2026 Notes are being amortized to expense over the expected life the 2026 Notes using the effective interest method. Issuance costs attributable to the equity component related to the conversion feature, totaling $2.9 million for the 2026 Notes were netted with the equity component.

The 2026 Notes consist of the following:



	As of June 30, 2019
Liability component:
Principal	$	316,250
Unamortized debt discount	(83,822		)
Unamortized debt issuance costs	(6,394		)
Net carrying amount	226,034

Equity component:
Net allocation of proceeds	84,412
Net issuance costs	(2,892		)
Net carrying amount	$	81,520

The following table sets forth total interest expense recognized related to the 2026 Notes:



	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Contractual interest expense	138		$	—	138		$	—
Amortization of debt issuance costs	45		—		45		—
Amortization of debt discount	590		—		590		—
Total	$	773	$	—	$	773	$	—

As of June 30, 2019, the remaining period over which the debt discount and debt issuance costs will be amortized was 6.9 years.

Capped Calls Transactions

In connection with the June 2019 convertible note offering, the Company entered into capped call transactions with one or more counterparties, or the Capped Calls. The Capped Calls each have an initial strike price of $88.6124 per share, subject to certain adjustments, which correspond to the initial conversion price of the 2026 Notes. The Capped Calls have initial cap prices of $139.00 per share. The Capped Calls are expected to offset the potential dilution to the common stock upon any conversion of the 2026 Notes and/or offset any cash payments the Company is required to make in excess of the principal amount of the 2026 Notes, as the case may be, in the event the market price per share of common stock is greater than the strike price of the Capped Call, with such offset subject to a cap. If, however, the market price per share of the common stock exceeds the cap price of the Capped Calls, there would be dilution and/or there would not be an offset of such potential cash payments, in each case, to the extent that the then-market price per share of the common stock exceeds the cap price. As the Capped Calls are considered indexed to the Company's stock and are considered equity classified, they are recorded in stockholders' equity on the condensed consolidated balance sheet and are not accounted for as derivatives. The cost of $40.8 million incurred in connection with the Capped Calls was recorded as a reduction to additional paid-in capital.