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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Convertible Debt Balances
The Notes consisted of the following balances reported in the Consolidated Balance Sheets as of December 31, 2020:
December 31,
2020
(In thousands)
Liability:
Principal amount$575,000 
Unamortized discount(95,744)
Unamortized debt issuance costs(12,055)
Convertible senior notes, liability component$467,201 
Equity:
Embedded conversion option$100,510 
Debt issuance costs(2,680)
Deferred tax impact(25,098)
Convertible senior notes, equity component (1)
$72,732 
_________________________________________________
(1)    Included in additional paid-in capital in the Consolidated Balance Sheets.
Summary of the 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 Consolidated Statements of Operations for the year ended December 31, 2020:
Year Ended
December 31,
2020
(In thousands)
Contractual coupon interest$379 
Amortization of discount$4,766 
Amortization of debt issuance costs$600