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Summary of significant accounting policies (Tables) | 6 Months Ended
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Jun. 30, 2020
Summary of significant accounting policies |
Summary of Estimated Useful Lives of Property and Equipment | Property and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the respective assets as follows: ​
​ | ​ | ​
​ |  | Useful life
Office equipment |  | 3 years
Electronic equipment |  | 3 years
Vehicle |  | 4 years
Laboratory equipment |  | 5 years
Manufacturing equipment |  | 10 years
Leasehold improvements |  | lesser of useful life or lease term
Schedule of concentration of risks | Concentration of customers The following customers accounted for 10% or more of revenue for the six months ended June 30, 2019 and 2020: ​
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2019 |  | 2020
​ | ​ | $ | ​ | $
​ | ​ | (Unaudited) | ​ | ​
A | ​ | 920 |  | *
B | ​ | * |  | *
C | ​ | * |  | *
D | ​ | 1,102 |  | *
E | ​ | * |  | 3,236
* | Represents less than 10% of revenue for the six months ended June 30, 2019 and 2020.
Concentration of suppliers The following suppliers accounted for 10% or more of research and development expenses and the inventory purchases for the six months ended June 30, 2019 and 2020: ​
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2019 |  | 2020
​ | ​ | $ | ​ | $
​ | ​ | (Unaudited) | ​ |
A | ​ | * | ​ | *
B | ​ | * | ​ | 12,313
C | ​ | 22,625 | ​ | *
D | ​ | * | ​ | *
E | ​ | * | ​ | 31,022
* | Represents less than 10% of research and development expenses and the inventory purchases for the six months ended June 30, 2019 and 2020.

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592 + Details
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