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Summary of significant accounting policies - Concentration of customers and concentration of suppliers (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Summary of significant accounting policies |  |
Revenue | $ 19,213 | $ 3,420
Research and development expenses | 102,049 | 58,928
Revenue | Concentration of customers | A |  |
Summary of significant accounting policies |  |
Revenue |  | 920
Revenue | Concentration of customers | D |  |
Summary of significant accounting policies |  |
Revenue |  | 1,102
Revenue | Concentration of customers | E |  |
Summary of significant accounting policies |  |
Revenue | 3,236 |
Research and Development Expenses | Concentration of suppliers | B |  |
Summary of significant accounting policies |  |
Research and development expenses | 12,313 |
Research and Development Expenses | Concentration of suppliers | C |  |
Summary of significant accounting policies |  |
Research and development expenses |  | $ 22,625
Research and Development Expenses | Concentration of suppliers | E |  |
Summary of significant accounting policies |  |
Research and development expenses | $ 31,022 |

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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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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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