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v3.20.2

Subsequent events (Details) - Subsequent event - Turning Point $ in Thousands | 1 Months Ended
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Jul. 31, 2020 USD ($)
Subsequent events |
Payment of upfront fees | $ 25,000
Maximum |
Subsequent events |
Additional milestone payments | $ 151,000

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount represents the additional milestone payments. + References No definition available. + Details
Name: | zlab_AdditionalMilestonePayments
Namespace Prefix: | zlab_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Payment of upfront fees for license agreement. + References No definition available. + Details
Name: | zlab_PaymentOfUpfrontFeesForLicenseAgreement
Namespace Prefix: | zlab_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=zlab_TurningPointTherapeuticsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |