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Supplementary Balance Sheet Information (Tables) | 3 Months Ended
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Mar. 31, 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 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 |
Schedule of Components of Property and Equipment | 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 Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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