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Significant agreements - Deferred revenue (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred revenue |  |  |
Deferred revenue | $ 33,082 | $ 5,657 | $ 14,635
AstraZeneca |  |  |
Deferred revenue |  |  |
Deferred revenue | 4,807 | $ 4,913 | $ 4,727
AstraZeneca | Target 3, Target 4, Target 5 and Target 6 Material Rights |  |  |
Deferred revenue |  |  |
Deferred revenue | $ 4,500 |  |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + 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=118944033&loc=SL49130531-203044 Reference 2: 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=118956577&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 + Details
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