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Convertible Senior Notes (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Convertible Debt Balances
The Notes consisted of the following balances reported in the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020:
March 31,
2021		December 31,
2020
(In thousands)
Liability:
Principal amount$575,000 $575,000 
Unamortized discount(91,173)(95,744)
Unamortized debt issuance costs(11,480)(12,055)
Convertible senior notes, liability component$472,347 $467,201 
Convertible senior notes, equity component (1)
$72,732 $72,732 
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(1)    Included in additional paid-in capital in the Condensed 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 Condensed Consolidated Statements of Operations for the three months ended March 31, 2021:
Three Months Ended
March 31, 2021
(In thousands)
Contractual coupon interest$359 
Amortization of discount$4,571 
Amortization of debt issuance costs$575