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Supplementary Balance Sheet Information (Tables)
 9 Months Ended
Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Investments Available-for-sale
Investments available for sale consist of the following:

As of September 30, 2023
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Market Value
Maturity less than 1 year:
Certificate of deposit$9,181 $3 $(3)$9,181 
Corporate debt securities12,194 3 (28)12,169 
Commercial paper7,616 — (3)7,613 
U.S. government agencies6,852 — (31)6,821 
U.S. treasury securities1,935 — (13)1,922 
Total maturity less than 1 year37,778 6 (78)37,706 
Maturity 1 to 2 years:
Corporate debt securities10,281 3 (85)10,199 
U.S. treasury securities18,478 — (253)18,225 
Total maturity 1 to 2 years28,759 3 (338)28,424 
Total short-term investments$66,537 $9 $(416)$66,130 


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 
Non U.S. government2,284 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 
Investments Available-for-sale in a Continuous Unrealized Loss Position
Investments available for sale that have been in a continuous unrealized loss position for greater than one-year consist of the following:
As of September 30, 2023
(in thousands)Fair Market ValueGross Unrealized Loss
Corporate debt securities$1,794 $(10)
Schedule of Components of Property and Equipment
Property and equipment consist of the following:
 
(in thousands)As of September 30,
2023		As of December 31,
2022
Furniture and office equipment$1,081 $1,066 
Leasehold improvements2,568 2,560 
Laboratory equipment1,332 1,056 
4,981 4,682 
Less—accumulated depreciation and amortization(3,664)(3,413)
Property and equipment, net$1,317 $1,269 
Schedule of Accrued Liabilities
Accrued liabilities consisted of the following:

(in thousands)As of September 30,
2023		As of December 31,
2022
Accrued compensation$2,455 $1,849 
Clinical trials2,878 2,333 
Research agreements and services591 509 
Director fees125 125 
Patent, license and other fees33 24 
Other accrued liabilities69 337 
Total accrued liabilities$6,151 $5,177