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Summary of significant accounting policies - Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |  |  |
Deferred revenue | $ 3.9 |  | $ 3.9 |  | $ 4.4
Revenue recognized included in deferred revenue in prior period | 0.7 | $ 0.2 | 3.6 | $ 0.8 |
Prepaid expenses and other current asset | Barda Agreement |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract assets | $ 1.1 |  | $ 1.1 |  | $ 0.5

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