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Commitments and contingencies - Narrative (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2020 | Apr. 29, 2020 | Dec. 31, 2019 | May 31, 2019 | Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | May 29, 2020 | Apr. 20, 2017 | Jun. 30, 2016
Akcea |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Upfront licensing fee |  |  |  |  |  | $ 12.0 |  |  |  |
Akcea | Maximum |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Milestone payments |  |  |  |  |  |  | $ 4.0 |  |  |
Censa |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Asset acquisition, milestone, amount |  |  |  |  |  |  |  | $ 217.5 |  |
Asset acquisition, development and regulatory milestones |  |  |  |  |  |  |  | 109.0 |  |
Asset acquisition, net sales milestone |  |  |  |  |  |  |  | 160.0 |  |
Asset acquisition, initial milestone |  |  |  |  |  |  |  | 30.0 |  |
Censa | Maximum |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Asset acquisition, milestone, amount |  |  |  |  |  |  |  | $ 217.5 |  |
Non-collaborative Arrangement Transactions | Marathon Pharmaceuticals, LLC |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  |  |  |  |  |  |  |  | $ 50.0 |
Non-collaborative Arrangement Transactions | Akcea |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Milestone payments |  |  | $ 4.0 | $ 6.0 |  | 4.0 | $ 6.0 |  |  |
Agilis |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  | $ 40.0 |  |  | $ 40.0 | 40.0 |  |  |  |
Net sales amount |  | 150.0 |  |  |  |  |  |  |  |
Milestone obligation payments made |  |  |  |  | 2.4 |  |  |  |  |
Development milestone payment obligations, net of cancellation and forfeiture |  |  |  |  |  | 20.0 |  |  |  |
Development milestone obligation payments made |  |  |  |  | 2.4 |  |  |  |  |
Agilis | Rights Exchange Agreement |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Priority review voucher amount |  | 174.0 |  |  |  |  |  |  |  |
Contingent Liability cancellation and forfeiture, Milestone, Potential Achievements, Priority Review Voucher Amount |  |  |  |  |  | 174.0 |  |  |  |
Development milestone payment obligations, cancellation and forfeiture |  |  |  |  |  | 37.6 |  |  |  |
Development milestone payment obligations, net of cancellation and forfeiture |  | 20.0 |  |  |  |  |  |  |  |
Contingent liability, cancellation and forfeiture | $ 211.6 | 211.6 |  |  |  |  |  |  |  |
Contingent liability, milestone, potential achievements, priority review voucher amount, net of cancellation and forfeiture |  | $ 361.0 |  |  |  |  |  |  |  |
Agilis | Maximum |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay | 40.0 |  |  |  | 60.0 | 60.0 |  |  |  |
Priority review voucher amount |  |  |  |  |  | 535.0 |  |  |  |
Net sales amount |  |  |  |  | $ 150.0 | $ 150.0 |  |  |  |
Product sales |  | 6.00% |  |  | 6.00% | 6.00% |  |  |  |
Agilis | Maximum | Rights Exchange Agreement |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Contingent liability, milestone, potential achievements, priority review voucher amount, net of cancellation and forfeiture |  |  |  |  |  | $ 361.0 |  |  |  |
Agilis | Minimum |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay | $ 37.6 | $ 37.6 |  |  |  |  |  |  |  |
Product sales |  | 2.00% |  |  | 2.00% | 2.00% |  |  |  |
Agilis | Non-collaborative Arrangement Transactions |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  |  |  |  | $ 40.0 | $ 40.0 |  |  |  |
BioElectron | Maximum |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  |  |  |  | 200.0 | 200.0 |  |  |  |
Net product revenue | Wellcome trust |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  |  |  |  |  |  |  |  |  | $ 0.8
Net product revenue | Wellcome trust | Maximum |  |  |  |  |  |  |  |  |  |
Other Commitments [Abstract] |  |  |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  |  |  |  | $ 22.4 | $ 22.4 |  |  |  |

X
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