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Revenue recognition - Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) Distributor | Sep. 30, 2020 USD ($) Distributor | Sep. 30, 2021 USD ($) segment Distributor | Sep. 30, 2020 USD ($) Distributor | Dec. 31, 2020 USD ($) | Nov. 30, 2011 USD ($)
Revenue recognition |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  | 1 |  |  |
Number of distributors | Distributor |  | 2 | 2 | 2 | 2 |  |
Contract with customer, liability |  | $ 0 |  | $ 0 |  | $ 4,200,000 |
Contract with customer, asset |  | 0 |  | 0 |  | $ 0 |
Performance obligations satisfied in period |  |  | $ 2,000,000.0 | 4,000,000.0 | $ 6,000,000.0 |  |
Deferred consideration payable |  | 0 |  | 0 |  |  |
Remaining potential milestones that can be achieved |  | 325,000,000.0 |  | 325,000,000.0 |  |  |
Revenue |  | $ 138,743,000 | $ 118,404,000 | $ 373,364,000 | $ 261,902,000 |  |
Minimum |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Percentage of net product sales threshold |  | 10.00% | 10.00% | 10.00% | 10.00% |  |
Net product revenue |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | $ 115,605,000 | $ 82,708,000 | $ 309,998,000 | $ 226,143,000 |  |
Net product revenue | Non-US |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 68,500,000 | 44,200,000 | 170,200,000 | 124,000,000.0 |  |
Emflaza | United States |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 47,100,000 | 38,500,000 | 139,800,000 | 102,100,000 |  |
Translarna | Non-US |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 67,200,000 | 43,400,000 | 166,300,000 | 122,700,000 |  |
Collaboration revenue |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 10,011,000 | 35,000,000 | 30,018,000 | 35,063,000 |  |
Royalty revenue |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 13,127,000 | 696,000 | 33,348,000 | 696,000 |  |
SMA License Agreement | Collaboration revenue |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 10,000,000.0 | 35,000,000.0 | 30,000,000.0 | 35,100,000 |  |
SMA License Agreement | Royalty revenue |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 13,100,000 | 700,000 | 33,300,000 | 700,000 |  |
SMA License Agreement | Roche And SMA Foundation | Collaboration revenue |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Revenue |  | 10,000,000.0 | $ 35,000,000.0 | 30,000,000.0 | $ 35,100,000 |  |
Research And Development Event Milestones | SMA License Agreement |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Milestone payments received | $ 10,000,000.0 |  |  |  |  |  |
Research And Development Event Milestones | SMA License Agreement | Maximum |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Remaining potential milestones that can be achieved |  |  |  |  |  |  | $ 135,000,000.0
Sales Milestones | SMA License Agreement |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Remaining potential milestones that can be achieved |  | $ 325,000,000.0 |  | $ 325,000,000.0 |  |  |
Sales Milestones | SMA License Agreement | Maximum |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |
Remaining potential milestones that can be achieved |  |  |  |  |  |  | $ 325,000,000.0

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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