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Investments (Tables)
 9 Months Ended
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost and Estimated Fair Value of Investments

The following table summarizes the amortized cost and estimated fair value of the Company's U.S. Treasury securities and U.S. government-sponsored enterprise securities, which are considered to be available-for-sale investments and were included in short-term investments as of September 30, 2023 and in short-term investments and long-term investments as of December 31, 2022 (in thousands):

 

 

 

September 30, 2023

 

 

Amortized Cost

 

 

Gross Unrealized Gains

 

 

Gross Unrealized Losses

 

 

Fair Value

 

U.S. Treasury securities

 

$

32,957

 

 

$

3

 

 

$

(47

)

 

$

32,913

 

U.S. government-sponsored enterprise securities

 

 

79,576

 

 

 

—

 

 

 

(258

)

 

 

79,318

 

 

$

112,533

 

 

$

3

 

 

$

(305

)

 

$

112,231

 

 

 

 

December 31, 2022

 

 

Amortized Cost

 

 

Gross Unrealized Gains

 

 

Gross Unrealized Losses

 

 

Fair Value

 

Short-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasury securities

 

$

32,174

 

 

$

3

 

 

$

(34

)

 

$

32,143

 

U.S. government-sponsored enterprise securities

 

 

66,106

 

 

 

68

 

 

 

(85

)

 

 

66,089

 

Long-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

U.S. Treasury securities

 

 

7,242

 

 

 

—

 

 

 

(4

)

 

 

7,238

 

U.S. government-sponsored enterprise securities

 

 

34,686

 

 

 

—

 

 

 

(43

)

 

 

34,643

 

 

$

140,208

 

 

$

71

 

 

$

(166

)

 

$

140,113