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Marketable Securities | 12 Months Ended
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Dec. 31, 2021
Investments Debt And Equity Securities [Abstract] |
Marketable Securities |
4. | Marketable Securities
The Company’s marketable securities, which consist of highly liquid marketable debt securities, are classified as available-for-sale and are stated at fair value. The following tables summarize the Company’s marketable securities (in thousands):
As of December 31, 2021 |  | Maturity (in years) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
U.S. Treasury securities |  | 1 or less |  | $ | 2,492 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 2,491 |
Negotiable certificates of deposit |  | 1 or less |  |  | 1,190 |  |  |  | — |  |  |  | (1 | ) |  |  | 1,189 |
U.S. Treasury securities |  | 1 - 2 |  |  | 63,034 |  |  |  | — |  |  |  | (153 | ) |  |  | 62,881 |
Negotiable certificates of deposit |  | 1 - 2 |  |  | 2,687 |  |  |  | — |  |  |  | (3 | ) |  |  | 2,684 |
Corporate debt securities |  | 1 - 2 |  |  | 15,879 |  |  |  | — |  |  |  | (29 | ) |  |  | 15,850 |
Total |  |  |  | $ | 85,282 |  |  | $ | — |  |  | $ | (187 | ) |  | $ | 85,095 |
As of December 31, 2020 |  | Maturity (in years) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
Corporate debt securities |  | 1 or less |  | $ | 3,612 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 3,610 |
Corporate debt securities |  | 1 - 2 |  |  | 3,072 |  |  |  | — |  |  |  | (3 | ) |  |  | 3,069 |
Total |  |  |  | $ | 6,684 |  |  | $ | — |  |  | $ | (5 | ) |  | $ | 6,679 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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