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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2021
Fair Value Measurements [Abstract] |
Liabilities Measured at Fair Value on a Recurring Basis | The following table sets forth the Company’s liabilities that were measured at fair value on a recurring basis by level within the fair value hierarchy:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2020 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Liabilities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Convertible preferred stock warrant liability | ​ | $ | — | ​ | $ | — | ​ | $ | 3,911 | ​ | $ | 3,911
Total liabilities | ​ | $ | — | ​ | $ | — | ​ | $ | 3,911 | ​ | $ | 3,911
Fair Value of the Company's Convertible Preferred Stock Warrants | The following table sets forth a summary of changes in the estimated fair value of the Company’s convertible preferred stock warrants during the nine months ended:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30,
(in thousands) |  | 2021 |  | 2020
Beginning of the period | ​ | $ | 3,911 | ​ | $ | 3,540
Change in fair value | ​ |  | 13,294 | ​ |  | (17)
Conversion to common stock warrants | ​ | ​ | (17,205) | ​ | ​ | —
End of the period | ​ | $ | — | ​ | $ | 3,523

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- Definition Tabular disclosure of liabilities, 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). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + 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=123874694&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=123874694&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=123874694&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=123874694&loc=d3e19279-110258 + Details
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