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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Components of Short-term investments
Short-term investments available-for-sale securities consist of the following:

As of December 31, 2023
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Market Value
Maturity less than 1 year:
Certificate of deposit$8,317 $16 $— $8,333 
Corporate debt securities10,948 8 (16)10,940 
Commercial paper6,193 9 — 6,202 
U.S. government agencies835 — (1)834 
Total maturity less than 1 year26,293 33 (17)26,309 
Maturity 1 to 2 years:
Corporate debt securities8,437 6 (10)8,433 
U.S. treasury securities18,505 — (79)18,426 
Total maturity 1 to 2 years26,942 6 (89)26,859 
Total short-term investments$53,235 $39 $(106)$53,168 


As of December 31, 2022
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Market Value
Maturity less than 1 year:
Certificate of deposit$16,101 $3 $(81)$16,023 
Corporate debt securities44,806 8 (275)44,539 
Commercial paper13,203 4 (20)13,187 
U.S. government agencies2,284 4 — 2,288 
U.S. treasury securities7,905 — (18)7,887 
Total maturity less than 1 year84,299 19 (394)83,924 
Maturity 1 to 2 years:
Corporate debt securities5,016 1 (21)4,996 
Total maturity 1 to 2 years5,016 1 (21)4,996 
Total short-term investments$89,315 $20 $(415)$88,920 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
Investments available for sale that have been in a continuous unrealized loss position for greater than one-year consist of the following:
As of December 31, 2023
(in thousands)Fair Market ValueGross Unrealized Loss
Corporate debt securities$397 $(3)
Total short-term investments$397 $(3)


As of December 31, 2022
(in thousands)Fair Market ValueGross Unrealized Loss
Corporate debt securities$17,084 $(161)
U.S. treasury securities3,666 (14)
Total short-term investments$20,750 $(175)
Components of Property and Equipment The estimated useful lives of the major classes of property and equipment are as follows:
Estimated Useful Lives
Furniture and office equipment
3 to 5 years
Leasehold improvements
4 to 6 years
Laboratory equipment5 years
Property and equipment consisted of the following:
 As of December 31,
(in thousands)20232022
Furniture and office equipment$1,067 $1,066 
Leasehold improvements2,568 2,560 
Laboratory equipment1,355 1,056 
Property and equipment, gross4,990 4,682 
Less—accumulated depreciation(3,752)(3,413)
Property and equipment, net$1,238 $1,269 
Components of Accrued Liabilities
Accrued liabilities consisted of the following:
 As of December 31,
(in thousands)20232022
Accrued compensation$2,737 $1,849 
Clinical trials4,309 2,333 
Research agreements and services530 509 
Other accrued liabilities207 486 
Total accrued liabilities$7,783 $5,177