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Supplementary Balance Sheet Information
9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplementary Balance Sheet Information Supplementary Balance Sheet Information
Investments available for sale consist of the following:

As of September 30,
2021
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Market Value
Certificate of deposit$2,609 $$— $2,610 
Corporate debt securities77,901 15 (6)77,910 
Commercial paper12,434 (2)12,436 
Non U.S. government732 — — 732 
U.S. treasury securities27,190 (1)27,194 
Total short term investments$120,866 $25 $(9)$120,882 

 
Property and equipment consist of the following:
 
(in thousands)As of September 30,
2021
As of December 31,
2020
Furniture and office equipment$866 $798 
Leasehold improvements1,962 1,962 
Laboratory equipment884 868 
3,712 3,628 
Less—accumulated depreciation and amortization(3,329)(3,004)
Property and equipment, net$383 $624