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Supplementary Balance Sheet Information | 6 Months Ended
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Jun. 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 June 30, 2021
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Certificate of deposit | 1,739 |  |  | 1 |  |  | — |  |  | 1,740 |
Corporate debt securities | 87,689 |  |  | 10 |  |  | (21) |  |  | 87,678 |
Commercial paper | 12,780 |  |  | 3 |  |  | (1) |  |  | 12,782 |
Non U.S. government | 737 |  |  | — |  |  | — |  |  | 737 |
U.S. treasury securities | 26,535 |  |  | 2 |  |  | (4) |  |  | 26,533 |
Total short term investments | $ | 129,480 |  |  | $ | 16 |  |  | $ | (26) |  |  | $ | 129,470 |
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 improvements | 1,962 |  |  | 1,962 |
Laboratory equipment | 853 |  |  | 868 |
| 3,640 |  |  | 3,628 |
Less—accumulated depreciation and amortization | (3,218) |  |  | (3,004) |
Property and equipment, net | $ | 422 |  |  | $ | 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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