Convertible Notes (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of convertible notes

The Company’s convertible notes are shown in the following table:

	As of December 31,
(In thousands)	2020		2019
2023 Notes	$	172,500	$	172,500
Unamortized discount - 2023 Notes	(15,420)		(22,163)
Unamortized debt issuance costs - 2023 Notes	(1,049)		(1,549)
Total convertible notes	156,031		148,788
Less current portion	—		—
Total long-term convertible notes	$	156,031	$	148,788

Schedule of interest expense on notes

Interest expense related to the notes for the years ended December 31, 2020, 2019 and 2018 was as follows:

	Years Ended December 31,
(In thousands)	2020		2019		2018
2023 Notes coupon interest at a rate of 1.375%	$	2,372	$	2,372	$	2,372
2023 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 4.9%	7,243		6,854		6,486
2018 Notes coupon interest at a rate of 1.125%	—		—		377
2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5%	—		—		2,756
Total interest expense on convertible notes	$	9,615	$	9,226	$	11,991