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Supplementary Balance Sheet Information (Tables)
6 Months Ended
Jun. 30, 2021
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,
2021
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Market Value
Certificate of deposit1,739 — 1,740 
Corporate debt securities87,689 10 (21)87,678 
Commercial paper12,780 (1)12,782 
Non U.S. government737 — — 737 
U.S. treasury securities26,535 (4)26,533 
Total short term investments$129,480 $16 $(26)$129,470 
Schedule of Components of Property and Equipment
Property and equipment consist of the following:
 
(in thousands)As of June 30,
2021
As of December 31,
2020
Furniture and office equipment$825 $798 
Leasehold improvements1,962 1,962 
Laboratory equipment853 868 
3,640 3,628 
Less—accumulated depreciation and amortization(3,218)(3,004)
Property and equipment, net$422 $624