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Investments and Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Components of Investments
At December 31, 2023, our investments consisted of the following (in thousands):

As of December 31, 2023
Fair Value MeasurementBalance Sheet Classification
Fair Value LevelCost BasisUnrealized Gains (Losses)
Fair Value
Cash and Cash EquivalentsShort-term Investments and Marketable Securities
Cash
Level 1$— $— $93,029 $93,029 $— 
Money market fundLevel 156,322 — 56,322 56,322 — 
U.S. Treasury bondsLevel 14,830 (2)4,828 — 4,828 
Agency bondsLevel 24,828 (3)4,825 — 4,825 
Total investments$65,980 $(5)$159,004 $149,351 $9,653