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CASH EQUIVALENTS AND MARKETABLE SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2022
Cash and Cash Equivalents [Abstract]  
Debt Securities, Available-for-sale
The marketable securities consist of the following (in thousands):
As of March 31, 2022
Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueCash and Cash EquivalentsMarketable Securities
Money market funds$193,627 $— $— $193,627 $193,627 $— 
Certificate of Deposit6,000 — (1)5,999 — 5,999 
Commercial paper164,243 — (379)163,864 — 163,864 
Corporate notes and bonds164,858 1 (2,860)161,999 — 161,999 
U.S. Government agency securities486,902 — (7,143)479,759 — 479,759 
Total$1,015,630 $1 $(10,383)$1,005,248 $193,627 $811,621 
As of December 31, 2021
Amortized CostGross Unrealized GainsGross Unrealized LossesFair ValueCash and Cash EquivalentsMarketable Securities
Money market funds$35,789 $— $— $35,789 $35,789 $— 
Certificate of Deposit16,001 — (2)15,999 6,000 9,999 
Commercial paper215,964 — (114)215,850 26,997 188,853 
Corporate notes and bonds199,244 — (872)198,372 760 197,612 
U.S. Treasuries14,999 — (1)14,998 — 14,998 
U.S. Government agency securities487,743 — (1,870)485,873 — 485,873 
Total$969,740 $— $(2,859)$966,881 $69,546 $897,335 
Investments Classified by Contractual Maturity Date
The following table summarizes the contractual maturities of the Company’s marketable securities as of March 31, 2022 (in thousands):
Amortized CostFair Value
Due within one year$692,296 $689,588 
Due within one to three years323,334 315,660 
Total$1,015,630 $1,005,248