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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Summary of the valuation of cash equivalents and marketable securities by pricing levels The following table presents the financial instruments that are carried at fair value and summarizes the valuation of its cash equivalents and marketable securities by the above pricing levels as of December 31, 2021 and 2020:
As of December 31, 2021
(In thousands)TotalQuoted Market Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Money market funds$7,402 $7,402 $— $— 
U.S. Government bonds and notes102,812 — 102,812 — 
Corporate notes, bonds and commercial paper287,905 — 287,905 — 
Total available-for-sale securities
$398,119 $7,402 $390,717 $— 
As of December 31, 2020
(In thousands)TotalQuoted Market Prices in Active Markets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Money market funds$18,162 $18,162 $— $— 
U.S. Government bonds and notes169,633 — 169,633 — 
Corporate notes, bonds and commercial paper253,391 — 253,391 — 
Total available-for-sale securities
$441,186 $18,162 $423,024 $— 
Financial instruments not carried at fair value but requiring fair value disclosure
The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure as of December 31, 2021 and 2020:
As of December 31, 2021As of December 31, 2020
(In thousands)Face
Value
Carrying ValueFair
Value
Face
Value
Carrying ValueFair
Value
1.375% Convertible Senior Notes due 2023 (the “2023 Notes”)$172,500 $163,687 $254,103 $172,500 $156,031 $194,709