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Fair Value Measurements - Available For Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value of available for sale marketable securities |  |
Amortized Cost | $ 12,069 | $ 29,195
Gross Unrealized Gains |  | 4
Gross Unrealized Losses | (6) | (55)
Fair Value | 12,063 | 29,144
U.S. Treasury securities |  |
Fair value of available for sale marketable securities |  |
Amortized Cost | 6,936 | 22,020
Gross Unrealized Gains |  | 4
Gross Unrealized Losses | (3) | (23)
Fair Value | 6,933 | 22,001
U.S. Government agency securities |  |
Fair value of available for sale marketable securities |  |
Amortized Cost | 5,133 | 7,175
Gross Unrealized Losses | (3) | (32)
Fair Value | $ 5,130 | $ 7,143

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