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Financial Instruments and Fair Value Measurements - Changes in fair value of the Level 3 liabilities (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 25, 2021 | Dec. 31, 2010 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Changes in fair value of the Level 3 liabilities |  |  |  |  |  |
Balance at beginning |  |  |  |  | $ 2,209 | $ 1,674
Fair value recognized upon the issuance of debt |  |  |  |  |  | 718
Change in the fair value of the liability |  |  |  |  | (233) | (168)
Balance at the end |  |  | $ 10,918 | $ 2,224 | 10,918 | 2,224
Proceeds from simple agreements for future equity |  |  |  |  | 8,942 |
Warrant Liability |  |  |  |  |  |
Changes in fair value of the Level 3 liabilities |  |  |  |  |  |
Balance at beginning |  |  |  |  |  | 181
Change in the fair value of the liability |  |  |  |  |  | (33)
Balance at the end |  |  |  | 148 |  | 148
Warrant Liability | Warrants for series A1 preferred stock |  |  |  |  |  |
Changes in fair value of the Level 3 liabilities |  |  |  |  |  |
Change in the fair value of the liability |  |  |  | 1 |  | 33
Warrants issued |  | 180,724 |  |  |  |
Derivative Liability. |  |  |  |  |  |
Changes in fair value of the Level 3 liabilities |  |  |  |  |  |
Balance at beginning |  |  |  |  | 2,209 | 1,493
Fair value recognized upon the issuance of debt |  |  |  |  |  | 718
Change in the fair value of the liability |  |  |  |  | (2,209) | (135)
Balance at the end |  |  |  | $ 2,076 |  | $ 2,076
SAFE |  |  |  |  |  |
Changes in fair value of the Level 3 liabilities |  |  |  |  |  |
Fair value recognized upon the issuance of debt |  |  |  |  | 8,942 |
Change in the fair value of the liability |  |  | 932 |  | 1,976 |
Balance at the end |  |  | $ 10,918 |  | $ 10,918 |
Proceeds from simple agreements for future equity | $ 8,942 |  |  |  |  |

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- Definition The cash inflow from simple agreements for future equity ("SAFEs) entered into by the company during the period. + References No definition available. + Details
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- Definition Number of warrants issued during the period. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (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 (c)(1a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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=123874694&loc=d3e19207-110258 + Details
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