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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2022
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 below pricing levels as of March 31, 2022 and December 31, 2021:
 As of March 31, 2022
(In thousands)Total
Quoted Market Prices in Active Markets
 (Level 1)
Significant Other Observable Inputs
 (Level 2)
Significant Unobservable Inputs
 (Level 3)
Money market funds$6,058 $6,058 $— $— 
U.S. Government bonds and notes63,023 — 63,023 — 
Corporate notes, bonds and commercial paper111,314 — 111,314 — 
Total available-for-sale securities$180,395 $6,058 $174,337 $— 
 As of December 31, 2021
(In thousands)Total
Quoted 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 $— 
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 require fair value disclosure as of March 31, 2022 and December 31, 2021:
 As of March 31, 2022As of December 31, 2021
(In thousands)
Face
 Value (1)
Carrying
 Value
Fair Value
Face
 Value
Carrying
 Value
Fair Value
1.375% Convertible Senior Notes due 2023 (the “2023 Notes”)$64,604 $73,860 $111,856 $172,500 $163,687 $254,103 
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(1)    As of March 31, 2022, the $64.6 million balance consisted of $49.4 million aggregate principal amount of 2023 Notes, as well as the face value of the remaining 2023 Notes Partial Repurchase of $15.2 million.