Debt

6 Months Ended

Jun. 30, 2020

Debt

Debt

7. Debt

Our debt consists of:

	June 30,		December 31,
(In thousands)	2020		2019
2023 Notes	$	240,984	$	240,984
2025 Notes		192,500		192,500
Total debt		433,484		433,484
Unamortized debt discount and issuance costs		(52,254)		(56,364)
Net long-term debt	$	381,230	$	377,120

Convertible Senior Notes Due 2025

In accordance with accounting guidance for debt with conversion and other options, we separately account for the liability and equity components of the 2025 Notes by allocating the proceeds between the liability component and the embedded conversion option (“equity component”) due to our ability to settle the conversion obligation of the 2025 Notes in cash, common stock or a combination of cash and common stock, at our option. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature using the income approach. The allocation was performed in a manner that reflected our non-convertible debt borrowing rate for similar debt. The equity component of the 2025 Notes was recognized as a debt discount and represents the difference between the proceeds from the issuance of the 2025 Notes and the fair value of the liability of the 2025 Notes on the date of issuance. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense using the effective interest method over the term of the 2025 Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.

Our outstanding 2025 Notes balances consisted of the following:

	June 30,		December 31,
(In thousands)	2020		2019
Liability component
Principal	$	192,500	$	192,500
Debt discount and issuance costs, net		(50,768)		(54,597)
Net carrying amount	$	141,732	$	137,903
Equity component, net	$	65,361	$	65,361

The following table sets forth total interest expense recognized related to the 2025 Notes for the three and six months ended June 30, 2020 and 2019:

	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2020		2019		2020		2019
Contractual interest expense	$	1,203	$	1,203	$	2,406	$	2,406
Amortization of debt issuance costs		149		136		294		269
Amortization of debt discount		1,786		1,635		3,535		3,236
Total interest and amortization expense	$	3,138	$	2,974	$	6,235	$	5,911

Debt Maturities

The aggregate scheduled maturities of our long-term debt as of June 30, 2020, are as follows:

(In thousands)
Years ending December 31:
2020 to 2022	$	—
2023		240,984
2024		—
Thereafter		192,500
Total	$	433,484