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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Summary of Fair Value of Financial Assets and Liabilities Measured or Disclosed on a Recurring Basis | The following table sets forth the fair value of our financial assets and liabilities that are measured or disclosed on a recurring basis by level within the fair value hierarchy (in thousands):
| June 30, 2021
| Total Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Money market funds | $ | 84,650 |  |  | $ | 84,650 |  |  | $ | — |  |  | $ | — |
Commercial paper | 63,975 |  |  | — |  |  | 63,975 |  |  | — |
Corporate bonds | 16,964 |  |  | — |  |  | 16,964 |  |  | — |
Asset-backed securities | 5,375 |  |  | — |  |  | 5,375 |  |  | — |
Total | $ | 170,964 |  |  | $ | 84,650 |  |  | $ | 86,314 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Derivative liability for Exit Fee | $ | 663 |  |  | $ | — |  |  | $ | — |  |  | $ | 663 |
Total | $ | 663 |  |  | $ | — |  |  | $ | — |  |  | $ | 663 |
| December 31, 2020
| Total Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Money market funds | $ | 88,151 |  |  | $ | 88,151 |  |  | $ | — |  |  | $ | — |
Commercial paper | 62,729 |  |  | — |  |  | 62,729 |  |  | — |
Corporate bonds | 26,658 |  |  | — |  |  | 26,658 |  |  | — |
U.S. government-sponsored agency bonds | 9,279 |  |  | — |  |  | 9,279 |  |  | — |
U.S. treasury notes | 1,000 |  |  | — |  |  | 1,000 |  |  | — |
Total | $ | 187,817 |  |  | $ | 88,151 |  |  | $ | 99,666 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Derivative liability for Exit Fee | $ | 1,376 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,376 |
Total | $ | 1,376 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,376 |

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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=123874694&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=123874694&loc=d3e19207-110258 + Details
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