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Convertible Notes (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Schedule of convertible notes
The Company’s convertible notes are shown in the following table:
As of
(In thousands)March 31, 2022December 31, 2021
2023 Notes (1)
$74,011 $172,500 
Unamortized discount — 2023 Notes (2)
— (8,266)
Unamortized debt issuance costs — 2023 Notes(151)(547)
Total convertible notes73,860 163,687 
Less current portion73,860 163,687 
Total long-term convertible notes$— $— 
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(1)    As of March 31, 2022, the $74.0 million balance consisted of $49.4 million aggregate principal amount of 2023 Notes, as well as the carrying value and related conversion premium, totaling $24.6 million, of the remaining 2023 Notes Partial Repurchase.
(2)    On January 1, 2022, the Company adopted ASU No. 2020-06, “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40).” Refer to Note 2, “Recent Accounting Pronouncements,” for additional information.
Schedule of interest expense on notes
Interest expense related to the convertible notes for the three months ended March 31, 2022 and 2021 was as follows:
Three Months Ended
 March 31,
(In thousands)20222021
2023 Notes coupon interest at a rate of 1.375%$316 $593 
2023 Notes amortization of discount and debt issuance cost105 1,874 
Total interest expense on convertible notes$421 $2,467