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Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of significant accounting policies |
Summary of useful lives of property and equipment |
Asset category |  | Estimated useful life
Computer equipment and software |  | 3 years
Furniture and fixtures |  | 7 years
Laboratory equipment and office furniture |  | 7 years
Leasehold improvements |  | Remainder of lease term
Schedule of basic and diluted net loss per share attributable to common stockholders | The following table sets forth the potentially dilutive securities that have been excluded from the calculation of diluted net loss per share because to include them would be anti‑dilutive (in common stock equivalent shares):
|  | Year ended December 31,
|  | 2020 |  | 2019 |  | 2018
Series A convertible preferred stock |  | — |  | — |  | 612,446
Series B convertible preferred stock |  | — |  | — |  | 7,235,969
Series C convertible preferred stock |  | — |  | — |  | 4,712,698
Options to purchase common stock |  | 3,771,459 |  | 3,499,934 |  | 1,844,188
Total shares of common stock equivalents |  | 3,771,459 |  | 3,499,934 |  | 14,405,301

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- Definition Tabular disclosure of the useful life of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References No definition available. + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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