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Marketable Securities | 3 Months Ended
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Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | Marketable Securities Marketable securities as of March 31, 2020 and December 31, 2019 consisted of the following:
March 31, 2020 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 22,487 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,487 |
Total marketable securities designated as available-for-sale | $ | 22,487 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,487 |
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 |
Interest income from marketable securities was $113 and less than $1 during the three months ended March 31, 2020 and 2019, respectively.

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