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MARKETABLE SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Fair Value of Marketable Securities by Type of Security

The amortized cost, gross unrealized holding gains, gross unrealized holding losses and fair value of our marketable securities by type of security as of June 30, 2024 and December 31, 2023 was as follows:
JUNE 30, 2024
(in thousands)Fair Value Hierarchy LevelAmortized CostGross Unrealized Holding GainsGross Unrealized Holding Losses Fair Value
Money market fundsLevel 1$9,944 $— $— $9,944 
U.S. treasury securitiesLevel 137,726 1 (34)37,693 
U.S. government agency securitiesLevel 234,288 3 (41)34,250 
$81,958 $4 $(75)$81,887 
DECEMBER 31, 2023
(in thousands)Fair Value Hierarchy LevelAmortized CostGross Unrealized Holding GainsGross Unrealized Holding Losses Fair Value
Money market fundsLevel 1$14,538 $— $— $14,538 
U.S. treasury securitiesLevel 135,976 48 (6)36,018 
U.S. government agency securitiesLevel 251,434 31 (58)51,407 
$101,948 $79 $(64)$101,963 
Schedule of Marketable Securities by Balance Sheet Location Classification
The fair values of marketable securities by classification in the condensed consolidated balance sheets was as follows as of June 30, 2024 and December 31, 2023:
(in thousands)JUNE 30, 2024DECEMBER 31, 2023
Cash and cash equivalents$9,944 $16,528 
Marketable securities71,943 85,435 
$81,887 $101,963 
Schedule of Fair Values of Available-for-Sale Debt Securities by Contractual Maturity
The fair values of available-for-sale debt securities as of June 30, 2024 and December 31, 2023, by contractual maturity, are summarized as follows:
(in thousands)JUNE 30, 2024DECEMBER 31, 2023
Due in one year or less$71,994 $98,110 
Due after one year through two years9,893 3,853 
$81,887 $101,963