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Supplementary Balance Sheet Information | 9 Months Ended
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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 Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Certificate of deposit | $ | 2,609 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 2,610 |
Corporate debt securities | 77,901 |  |  | 15 |  |  | (6) |  |  | 77,910 |
Commercial paper | 12,434 |  |  | 4 |  |  | (2) |  |  | 12,436 |
Non U.S. government | 732 |  |  | — |  |  | — |  |  | 732 |
U.S. treasury securities | 27,190 |  |  | 5 |  |  | (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 improvements | 1,962 |  |  | 1,962 |
Laboratory equipment | 884 |  |  | 868 |
| 3,712 |  |  | 3,628 |
Less—accumulated depreciation and amortization | (3,329) |  |  | (3,004) |
Property and equipment, net | $ | 383 |  |  | $ | 624 |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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