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Summary of significant accounting policies (Tables) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Schedule of basic and diluted loss per share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | ​ | 2025 | ​ | 2024 | ​ | 2025 |  | 2024
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss | ​ | $ | (12,908) | ​ | $ | (14,619) | ​ | $ | (41,470) | ​ | $ | (29,366)
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares of Series A and Series B common stock outstanding, basic and diluted | ​ |  | 32,464,893 | ​ |  | 32,143,336 | ​ |  | 32,286,188 | ​ |  | 31,036,271
Net loss per share of Series A and Series B common stock outstanding, basic and diluted | ​ | $ | (0.40) | ​ | $ | (0.45) | ​ | $ | (1.28) | ​ | $ | (0.95)
Schedule of potentially dilutive securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Options to purchase Series A common stock | ​ | 5,694,175 | ​ | 4,322,367 | ​ | 5,694,175 | ​ | 4,322,367
Warrants to purchase Series A common stock | ​ | 1,000 | ​ | 1,000 | ​ | 1,000 | ​ | 1,000
Restricted stock units | ​ | 816,937 | ​ | 844,382 | ​ | 816,937 | ​ | 844,382
Total |  | 6,512,112 |  | 5,167,749 |  | 6,512,112 |  | 5,167,749

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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