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Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Convertible Debt Balances
The Notes consisted of the following balances reported in the Condensed Consolidated Balance Sheets as of March 31, 2022 and December 31, 2021:
March 31,
2022 (2)
December 31,
2021
(In thousands)
Liability:
Principal amount$575,000 $575,000 
Unamortized discount— (77,136)
Unamortized debt issuance costs(10,731)(9,712)
Convertible senior notes, liability component (1)
$564,269 $488,152 
Convertible senior notes, equity component$— $72,732 
_________________________________________________
(1)    Classified as a current liability as of both March 31, 2022 and December 31, 2021 in the Condensed Consolidated Balance Sheets.
(2)    Refer to Note 1, Organization and Summary of Significant Accounting Policies, for further information regarding the impact of the adoption of ASU 2020-06, effective January 1, 2022.
Summary of Components of Interest Expense
The following table summarizes the components of interest expense resulting from the Notes recognized in interest and other income (expense), net in the Condensed Consolidated Statements of Operations for the three months ended March 31, 2022 and 2021:
Three Months Ended March 31,
2022 (1)
2021
(In thousands)
Contractual coupon interest$359 $359 
Amortization of discount$— $4,571 
Amortization of debt issuance costs$764 $575 
_________________________________________________
(1)    Refer to Note 1, Organization and Summary of Significant Accounting Policies, for further information regarding the impact of the adoption of ASU 2020-06, effective January 1, 2022.