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Supplementary Balance Sheet Information | 3 Months Ended
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Mar. 31, 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 March 31, 2021
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Market Value
Certificate of deposit | 2,599 |  |  | — |  |  | — |  |  | 2,599 |
Corporate debt securities | 81,518 |  |  | 1 |  |  | (69) |  |  | 81,450 |
Commercial paper | 5,745 |  |  | 1 |  |  | (1) |  |  | 5,745 |
Non U.S. government | 742 |  |  | — |  |  | (1) |  |  | 741 |
U.S. treasury securities | 20,385 |  |  | 3 |  |  | (1) |  |  | 20,387 |
Total short term investments | $ | 110,989 |  |  | $ | 5 |  |  | $ | (72) |  |  | $ | 110,922 |
Property and equipment consist of the following:
(in thousands) | As of March 31, 2021 |  | As of December 31, 2020
Furniture and office equipment | $ | 798 |  |  | $ | 798 |
Leasehold improvements | 1,962 |  |  | 1,962 |
Laboratory equipment | 853 |  |  | 868 |
| 3,613 |  |  | 3,628 |
Less—accumulated depreciation and amortization | (3,109) |  |  | (3,004) |
Property and equipment, net | $ | 504 |  |  | $ | 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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