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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale securities | Marketable securities as of December 31, 2021 and 2020 consisted of the following:
December 31, 2021 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 13,147 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,147 |
Total marketable securities designated as available-for-sale | $ | 13,147 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,147 |
December 31, 2020 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 20,142 |  |  | $ | — |  |  | $ | — |  |  | $ | 20,142 |
United States treasuries | 4,999 |  |  | — |  |  | — |  |  | 4,999 |
Total marketable securities designated as available-for-sale | $ | 25,141 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,141 |

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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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