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Marketable Securities | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Marketable securities as of December 31, 2020 and 2019 consisted of the following:
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 |
December 31, 2019 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 29,907 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,907 |
Total marketable securities designated as available-for-sale | $ | 29,907 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,907 |
The effective maturity date of the United States treasuries is less than one year. Interest income from marketable securities was $135 and $480 for the years ended December 31, 2020 and 2019, respectively.

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