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Cash and Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments Debt And Equity Securities [Abstract] |
Summary of Cash and Cash Equivalents and Marketable Securities | As of December 31, 2021 and 2020, cash and cash equivalents and marketable securities were comprised of the following:
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
As at December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Money market funds included in cash and cash equivalents |  | $ | 2,535 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,535 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  |  | 7,439 |  |  |  | — |  |  |  | — |  |  |  | 7,439 |
Total |  | $ | 9,974 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,974 |
As at December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Money market funds included in cash and cash equivalents |  | $ | 2,455 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,455 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury notes |  |  | 7,526 |  |  |  | — |  |  |  | — |  |  |  | 7,526 |
Total |  | $ | 9,981 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,981 |

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