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Convertible Notes (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of convertible notes
The Company’s convertible notes are shown in the following table:
As of
(In thousands)June 30, 2021December 31, 2020
2023 Notes$172,500 $172,500 
Unamortized discount — 2023 Notes(11,896)(15,420)
Unamortized debt issuance costs — 2023 Notes(798)(1,049)
Total convertible notes159,806 156,031 
Less current portion— — 
Total long-term convertible notes$159,806 $156,031 
Schedule of interest expense on notes
Interest expense related to the notes for the three and six months ended June 30, 2021 and 2020 was as follows:
Three Months EndedSix Months Ended
 June 30,June 30,
(In thousands)2021202020212020
2023 Notes coupon interest at a rate of 1.375%$593 $593 $1,186 $1,186 
2023 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 4.9%1,901 1,798 3,775 3,571 
Total interest expense on convertible notes$2,494 $2,391 $4,961 $4,757