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Redeemable Convertible Preferred Stock Warrant Liability (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Schedule of Stockholders' Equity Note, Warrants or Rights | The following table sets forth a summary of the changes in the estimated fair value of the Company’s redeemable convertible preferred stock warrants, which represents financial instruments with valuations classified as Level 3. When a determination is made to classify a financial instrument within Level 3, the determination is based upon the significance of the unobservable inputs to the overall fair value measurement. However, Level 3 financial instruments typically include, in addition to the unobservable inputs, observable inputs (that is, components that are actively quoted and can be validated to external sources). Accordingly, the gain or loss in the table below includes changes in fair value due in part to observable factors that are part of the Level 3 methodology recognized in the statement of operations as a component of interest and other income or expense as appropriate (in thousands):
|  |  | Year Ended December 31,
|  |  | 2021 |  | 2020 |  |
Beginning of the period |  |  | $ | 177 |  |  | $ | 870 |  |  |
Exercised |  |  | (113) |  |  | (508) |  |  |
Cancelled |  |  | (16) |  |  | — |  |  |
Change in fair value |  |  | (48) |  |  | (185) |  |  |
End of the period |  |  | $ | — |  |  | $ | 177 |  |  |
Warrants to purchase shares of redeemable convertible preferred stock outstanding and exercisable are as follows (in thousands, except per share data):
Dates |  |  |  |  |  | Exercise Price |  |  |  | Shares Outstanding at December 31, |  | Initial Value |  |  |  | Fair Value at December 31,
Issuance |  | Expiration |  |  |  | Series |  |  |  |  | 2021 |  | 2020 |  |  |  |  | 2021 |  | 2020
June 2017 |  | June 2022 |  |  |  | E |  | 13.73 |  |  |  |  | — |  |  | 72 |  |  | 763 |  |  |  |  | $ | — |  |  | $ | 177 |

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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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