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v3.20.2

Restricted net assets (Details) - PRC - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Jun. 30, 2020
Restricted net assets |  |
Minimum required percentage of statutory reserves |  | 10.00%
Percentage of statutory reserves to respective registered capital |  | 50.00%
Statutory reserves | $ 0 |
Restricted amount by subsidiaries | $ 155,858,000 | $ 205,858,000

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Minimum required percentage of statutory reserves. + References No definition available. + Details
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- Definition Percentage of statutory reserves to respective registered capital. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Definition Restricted net assets. + References No definition available. + Details
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- Definition Statutory reserves. + References No definition available. + Details
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Namespace Prefix: | zlab_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |