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Redeemable Convertible Preferred Stock Tranche Liability - Additional Information - (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Oct. 31, 2020
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary equity, par value | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 |
Change in fair value of redeemable convertible preferred stock tranche liability | $ 0 | $ 0 | $ 11,718 | $ 0 |  |
Series A 1 Redeemable Convertible Preferred Tranche Liability |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary equity, par value |  |  |  |  |  | $ 0.86
Change in fair value of redeemable convertible preferred stock tranche liability |  |  | 11,700 |  |  |
Series A - 1 Preferred Stock |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Change in fair value of redeemable convertible preferred stock tranche liability |  |  | $ 12,300 |  |  |

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- Definition Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=122040564&loc=d3e177068-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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