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Supplementary Balance Sheet Information (Tables)
 6 Months Ended
Jun. 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 June 30, 2023
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Market Value
Maturity less than 1 year:
Certificate of deposit$8,005 $— $(14)$7,991 
Corporate debt securities14,465 5 (53)14,417 
Commercial paper11,102 — (13)11,089 
U.S. government agencies7,841 — (39)7,802 
Total maturity less than 1 year41,413 5 (119)41,299 
Maturity 1 to 2 years:
Corporate debt securities8,711 16 (82)8,645 
U.S. treasury securities20,366 — (251)20,115 
Total maturity 1 to 2 years29,077 16 (333)28,760 
Total short-term investments$70,490 $21 $(452)$70,059 


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 June 30, 2023
(in thousands)Fair Market ValueGross Unrealized Loss
Corporate debt securities$2,963 $(24)
Schedule of Components of Property and Equipment
Property and equipment consist of the following:
 
(in thousands)As of June 30,
2023		As of December 31,
2022
Furniture and office equipment$1,081 $1,066 
Leasehold improvements2,568 2,560 
Laboratory equipment1,264 1,056 
4,913 4,682 
Less—accumulated depreciation and amortization(3,557)(3,413)
Property and equipment, net$1,356 $1,269 
Schedule of Accrued Liabilities
Accrued liabilities consisted of the following:

(in thousands)As of June 30,
2023		As of December 31,
2022
Accrued compensation$2,175 $1,849 
Clinical trials2,364 2,333 
Research agreements and services543 509 
Director fees125 125 
Patent, license and other fees83 24 
Other accrued liabilities211 337 
Total accrued liabilities$5,501 $5,177