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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Convertible Debt Balances
The Notes consisted of the following balances reported in the Condensed Consolidated Balance Sheets as of June 30, 2021 and December 31, 2020:
June 30,
2021		December 31,
2020
(In thousands)
Liability:
Principal amount$575,000 $575,000 
Unamortized discount(86,549)(95,744)
Unamortized debt issuance costs(10,897)(12,055)
Convertible senior notes, liability component$477,554 $467,201 
Convertible senior notes, equity component (1)
$72,732 $72,732 
_________________________________________________
(1)    Included in additional paid-in capital in the Condensed Consolidated Balance Sheets.
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 and six months ended June 30, 2021:
Three Months Ended June 30,Six Months Ended June 30,
20212021
(In thousands)
Contractual coupon interest$359 $719 
Amortization of discount$4,624 $9,195 
Amortization of debt issuance costs$583 $1,158