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Marketable Securities and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring and Nonrecurring Basis | As of December 31, 2020 and December 31, 2019, all of our marketable securities are classified as available-for-sale and consist of the following:
| Cost |  | Unrealized Gain (Loss) |  | Fair Value
Short-term marketable securities: |  |  |  |  |
As of December 31, 2020: |  |  |  |  |
Corporate debt securities | $ | 253 |  |  | $ | (3) |  |  | $ | 250 |
| $ | 253 |  |  | $ | (3) |  |  | $ | 250 |
As of December 31, 2019: |  |  |  |  |
Commercial paper | $ | 2,487 |  |  | $ | — |  |  | $ | 2,487 |
U.S. government treasury bills | 2,249 |  |  | 1 |  |  | 2,250 |
Corporate debt securities | 2,236 |  |  | 2 |  |  | 2,238 |
| $ | 6,972 |  |  | $ | 3 |  |  | $ | 6,975 |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following table presents information about our assets and liabilities measured at fair value on a recurring basis in the consolidated balance sheets as of December 31, 2020 and 2019:
| Level 1 |  | Level 2 |  | Level 3 |  | Total
As of December 31, 2020: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 23,832 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,832 |
Short-term marketable securities: |  |  |  |  |  |  |
Corporate debt securities | — |  |  | 250 |  |  | — |  |  | 250 |
As of December 31, 2019: |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 1,307 |  |  | $ | — |  |  | $ | — |  |  | 1,307 |
Short-term marketable securities: |  |  |  |  |  |  |
U.S. government treasury bills | 2,250 |  |  | — |  |  | — |  |  | 2,250 |
Commercial paper | — |  |  | 2,487 |  |  | — |  |  | 2,487 |
Corporate debt securities | — |  |  | 2,238 |  |  | — |  |  | 2,238 |

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- Definition Tabular disclosure of liabilities measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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