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v3.21.1

Nature of the business and basis of presentation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Nature of the business and basis of presentation |  |  |  |
Net loss | $ 15,090 | $ 11,886 | $ 79,207 | $ 43,755
Accumulated deficit | 224,617 |  | $ 209,527 |
Cash, cash equivalents and short-term marketable securities | $ 249,984 |  |  |

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