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Investments
3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Investments Investments
Marketable debt securities held by the Company are classified as available-for-sale pursuant to ASC 320, Investments - Debt and Equity Securities, and carried at fair value in the accompanying condensed consolidated balance sheets.
The following table summarizes the gross unrealized gains on the Company’s marketable securities as of March 31, 2024:

March 31, 2024
Gross Unrealized
(In thousands)Amortized CostGainsEstimated Fair Value
U.S. government agency bonds$15,195 $165 $15,360 
$15,195 $165 $15,360 
Short-term investments$15,360 
As of March 31, 2024, there was $0.2 million of interest receivable related to the outstanding debt securities held by the Company.
The following table summarizes the gross unrealized gains on the Company’s marketable securities as of December 31, 2023:
December 31, 2023
Gross Unrealized
(in thousands)Amortized CostGainsEstimated Fair Value
U.S. government agency bonds$19,651 $157 $19,808 
$19,651 $157 $19,808 
Short-term investments$19,808 
As of December 31, 2023, there was $0.2 million of interest receivable related to the outstanding debt securities held by the Company.