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Fair Value of Financial Assets and Liabilities (Tables) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Fair Value Disclosures [Abstract] |  |
Schedule of Assets and Liabilities Measured at Fair Value |  | The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy used to determine such fair values:
| Fair Value Measurements as of September 30, 2021 Using:
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash equivalents—money market funds | $ | 34,816 |  |  | $ | 27,788 |  |  | $ | — |  |  | $ | 62,604 |
| $ | 34,816 |  |  | $ | 27,788 |  |  | $ | — |  |  | $ | 62,604 |
Liabilities: |  |  |  |  |  |  |
Embedded derivative liability | $ | — |  |  | $ | — |  |  | $ | 491 |  |  | $ | 491 |
| $ | — |  |  | $ | — |  |  | $ | 491 |  |  | $ | 491 |
| Fair Value Measurements as of December 31, 2020 Using:
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash equivalents—money market funds | $ | 16,816 |  |  | $ | 28,018 |  |  | $ | — |  |  | $ | 44,834 |
| $ | 16,816 |  |  | $ | 28,018 |  |  | $ | — |  |  | $ | 44,834 |
Liabilities: |  |  |  |  |  |  |
Embedded derivative liability | $ | — |  |  | $ | — |  |  | $ | 455 |  |  | $ | 455 |
| $ | — |  |  | $ | — |  |  | $ | 455 |  |  | $ | 455 |
Summary of Aggregate Fair Values of Warrant Liability and Derivative Liability | The following table provides a roll-forward of the aggregate fair values financial instruments for which fair values are determined using Level 3 inputs:
(in thousands) | Embedded Derivative Liability |  |
Balance as of December 31, 2020 | $ | 455 |  |  |
Change in fair value | 36 |  |  |
Balance as of September 30, 2021 | $ | 491 |  |  |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://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 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 (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -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 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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