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Marketable Securities | 9 Months Ended
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Sep. 30, 2020
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities Marketable securities as of September 30, 2020 and December 31, 2019 consisted of the following:
September 30, 2020 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 7,507 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,507 |
United States treasuries | 14,996 |  |  | — |  |  | (1) |  |  | 14,995 |
Total marketable securities designated as available-for-sale | $ | 22,503 |  |  | $ | — |  |  | $ | (1) |  |  | $ | 22,502 |
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 $5 and $267 during the three months ended September 30, 2020 and 2019, respectively, and $132 and $299 during the nine months ended September 30, 2020 and 2019, respectively.

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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 + Details
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