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Convertible Notes (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of convertible notes
The Company’s convertible notes are shown in the following table:
As of December 31,
(In thousands)20212020
2023 Notes$172,500 $172,500 
Unamortized discount — 2023 Notes(8,266)(15,420)
Unamortized debt issuance costs — 2023 Notes(547)(1,049)
Total convertible notes163,687 156,031 
Less current portion163,687 — 
Total long-term convertible notes$— $156,031 
Schedule of interest expense on notes
Interest expense related to the notes for the years ended December 31, 2021, 2020 and 2019 was as follows:
Years Ended December 31,
(In thousands)202120202019
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%7,656 7,243 6,854 
Total interest expense on convertible notes
$10,028 $9,615 $9,226