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License agreements - MacroGenics (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
License agreements |  |  |  |  |  |
Research and development |  |  |  | $ 270,545 | $ 303,103 |
MacroGenics |  |  |  |  |  |
License agreements |  |  |  |  |  |
Upfront payment under license agreement |  |  | $ 150,000 |  |  |
Research and development | $ 5,000 | $ 10,000 |  | 9,400 | $ 6,500 |
MacroGenics | Accrued and other liabilities |  |  |  |  |  |
License agreements |  |  |  |  |  |
Accrued and other liabilities |  |  |  | $ 4,400 |  | $ 3,200
Minimum | MacroGenics |  |  |  |  |  |
License agreements |  |  |  |  |  |
Royalty payments on future global net sales (as a percent) |  |  | 15.00% |  |  |
Maximum | MacroGenics |  |  |  |  |  |
License agreements |  |  |  |  |  |
Royalty payments on future global net sales (as a percent) |  |  | 24.00% |  |  |
Development and Regulatory Milestones | Maximum | MacroGenics |  |  |  |  |  |
License agreements |  |  |  |  |  |
Additional milestone payments under the license agreement |  |  | $ 420,000 |  |  |
Commercialization Milestones | Maximum | MacroGenics |  |  |  |  |  |
License agreements |  |  |  |  |  |
Additional milestone payments under the license agreement |  |  | $ 330,000 |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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