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Marketable Securities | 9 Months Ended
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Sep. 30, 2021
Marketable Securities [Abstract] |
Marketable Securities | Marketable Securities Marketable securities as of September 30, 2021 and December 31, 2020 consisted of the following:
September 30, 2021 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Money market mutual funds | $ | 17,146 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,146 |
Total marketable securities designated as available-for-sale | $ | 17,146 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,146 |
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 |
The effective maturity date of the United States treasuries is less than one year. Interest income from marketable securities was $1 and $5 during the three months ended September 30, 2021 and 2020, respectively, and $5 and $132 during the nine months ended September 30, 2021 and 2020, 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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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