XML 95 R57.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Convertible Preferred Shares and Warrants - Additional Information (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 USD ($) $ / shares shares | Apr. 30, 2016 USD ($) $ / shares shares | Jan. 31, 2016 USD ($) $ / shares shares | Apr. 30, 2015 USD ($) $ / shares shares | Aug. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) Investor $ / shares shares | Sep. 20, 2017 shares | Jul. 19, 2017 $ / shares shares | Apr. 30, 2014 USD ($) | Mar. 31, 2014 USD ($)
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from convertible preferred shares | $ |  |  |  |  |  |  | $ 29,100,000 | $ 106,200,000 | $ 18,278,572 |  |  |  |
Change in fair value of warrants | $ |  |  |  |  |  |  | $ (200,000) | 1,920,000 | 1,980,000 |  |  |  |
Expected successful QIPO period |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Warrant |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants vesting period |  |  |  |  |  |  | Apr. 01, 2016 |  |  |  |  |  |
Warrant expiration prior date on consummates qualified initial public offering |  |  |  |  |  |  | 90 days |  |  |  |  |  |
A1, A2, B1, B2 and C Preferred Share |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of warrants | $ |  |  |  |  |  |  | $ (200,000) | $ 1,900,000 | $ 2,000,000 |  |  |  |
Dividends entitled to preferred shareholders |  |  |  |  |  |  | 8.00% |  |  |  |  |  |
Beneficial conversion feature | $ |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
A1, A2, B1, B2 and C Preferred Share | IPO |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ordinary shares issued upon conversion of preferred stock | shares |  |  |  |  |  |  |  |  |  | 28,905,083 |  |  |
Series A1 Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issued convertible preferred shares | shares |  |  |  |  |  | 6,244,443 |  | 8,466,665 |  |  |  |  |
Par value of issued convertible preferred shares |  |  |  |  |  | $ 0.00006 |  | $ 0.00006 |  |  |  |  |
Cash proceeds from convertible preferred shares | $ |  |  |  |  |  | $ 8,028,572 |  |  |  |  |  |  |
Convertible preferred shares, price per share |  |  |  |  |  | $ 1.2857 |  |  |  |  |  |  |
Convertible loans issued | $ |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 2,000,000
Convertible loans converted into preferred shares | shares |  |  |  |  |  | 2,222,222 |  |  |  |  |  |  |
Convertible loans converted into preferred shares, price per share |  |  |  |  |  | $ 0.90 |  |  |  |  |  |  |
Series A2 Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issued convertible preferred shares | shares |  |  |  |  | 8,442,221 |  |  | 8,442,221 |  |  |  |  |
Par value of issued convertible preferred shares |  |  |  |  | $ 0.00006 |  |  | $ 0.00006 |  |  |  |  |
Cash proceeds from convertible preferred shares | $ |  |  |  |  | $ 18,278,572 |  |  |  |  |  |  |  |
Convertible preferred shares, price per share |  |  |  |  | $ 2.1651 |  |  |  |  |  |  |  |
Number of warrant agreement | Investor |  |  |  |  |  |  |  |  | 1 |  |  |  |
Issuance warrants to purchase preferred shares | shares |  |  |  |  |  |  | 461,808 |  |  |  | 461,808 |  |
Issuance warrants to purchase preferred shares, price per share |  |  |  |  |  |  |  |  | $ 2.1651 |  | $ 2.1651 |  |
Change in fair value of warrants | $ |  |  |  |  |  |  |  |  | $ 1,980,000 |  |  |  |
Series A2 Convertible Preferred Shares | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance warrants to purchase preferred shares | shares |  |  |  |  |  |  |  |  | 461,808 |  |  |  |
Series B1 Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issued convertible preferred shares | shares |  |  |  | 5,562,335 |  |  |  | 5,562,335 |  |  |  |  |
Par value of issued convertible preferred shares |  |  |  | $ 0.00006 |  |  |  | $ 0.00006 |  |  |  |  |
Cash proceeds from convertible preferred shares | $ |  |  |  | $ 53,100,000 |  |  |  |  |  |  |  |  |
Convertible preferred shares, price per share |  |  |  | $ 9.5464 |  |  |  |  |  |  |  |  |
Series B2 Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issued convertible preferred shares | shares |  |  | 3,973,096 |  |  |  |  | 3,973,096 |  |  |  |  |
Par value of issued convertible preferred shares |  |  | $ 0.00006 |  |  |  |  | $ 0.00006 |  |  |  |  |
Cash proceeds from convertible preferred shares | $ |  |  | $ 53,100,000 |  |  |  |  |  |  |  |  |  |
Convertible preferred shares, price per share |  |  | $ 13.3649 |  |  |  |  |  |  |  |  |  |
Series C Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issued convertible preferred shares | shares |  | 1,998,958 |  |  |  |  |  |  |  |  |  |  |
Par value of issued convertible preferred shares |  | $ 0.00006 |  |  |  |  |  |  |  |  |  |  |
Cash proceeds from convertible preferred shares | $ |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |
Convertible preferred shares, price per share |  | $ 15.0078 |  |  |  |  |  |  |  |  |  |  |
Description of preferred share conversion rights |  |  |  |  |  |  | The initial conversion price shall equal the lower of (1) the issuance price of Series C Preferred Shares and (2) Calculated Price which is one hundred percent minus the discount rate of fifteen percent (the “Discount Rate”) multiplied by the offering price of the ordinary shares of the Company to the public on the date of the Qualified Initial Public Offering (“QIPO”). The Discount Rate will increase at increments of an additional two percent as of the first day of each successive six months period after June 2018 but shall in no event exceed twenty percent. |  |  |  |  |  |
Additional percentage of distribution to preferred shareholders on liquidation |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Percentage of internal rate of return on preferred share redemption |  |  |  |  |  |  | 15.00% |  |  |  |  |  |
Series C Preferred Shares | Maximum | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Additional Dividend Rate Percentage | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Series C Preferred Shares | Minimum [Member] | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Additional Dividend Rate Percentage | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
A1, A2, B1 and B2 Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares to ordinary shares conversion basis |  |  |  |  |  |  | one-for-one basis |  |  |  |  |  |
Series B One And B Two Convertible Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Shares and Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Additional percentage of distribution to preferred shareholders on liquidation |  |  |  |  |  |  | 5.00% |  |  |  |  |  |

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition A unique description of a noncash or part noncash stock conversion. The description would be expected to include sufficient information to provide an understanding of the nature and purpose of the conversion. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
Name: | us-gaap_ConversionOfStockDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ConvertibleDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 + Details
Name: | us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
Name: | us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 + Details
Name: | us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Describe the conversion features of preferred stock if preferred stock is convertible. That is, shares of preferred stock into which another convertible security was converted, or shares of preferred stock into which another class of preferred stock was converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 + Details
Name: | us-gaap_PreferredStockConversionBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 + Details
Name: | us-gaap_TemporaryEquityParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_TemporaryEquitySharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Class of warrant or right stock price per share. + References No definition available. + Details
Name: | zlab_ClassOfWarrantOrRightStockPricePerShare
Namespace Prefix: | zlab_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Convertible preferred shares and warrants. + References No definition available. + Details
Name: | zlab_ConvertiblePreferredSharesAndWarrantsLineItems
Namespace Prefix: | zlab_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected Qualified Initial Public Offering period. + References No definition available. + Details
Name: | zlab_ExpectedQualifiedInitialPublicOfferingPeriod
Namespace Prefix: | zlab_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of warrant agreement. + References No definition available. + Details
Name: | zlab_NumberOfWarrantAgreement
Namespace Prefix: | zlab_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of distribution of original issue price plus simple interest for preferred shares on liquidation. + References No definition available. + Details
Name: | zlab_PercentageOfDistributionOfOriginalIssuePricePlusSimpleInterestForPreferredSharesOnLiquidation
Namespace Prefix: | zlab_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of internal rate of return on preferred share redemption. + References No definition available. + Details
Name: | zlab_PercentageOfInternalRateOfReturnOnPreferredShareRedemption
Namespace Prefix: | zlab_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred stock increase annum each successive six months dividend rate percentage. + References No definition available. + Details
Name: | zlab_PreferredStockIncreaseAnnumEachSuccessiveSixMonthsDividendRatePercentage
Namespace Prefix: | zlab_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrant expiration on prior date on consummates qualified initial public offering. + References No definition available. + Details
Name: | zlab_WarrantExpirationOnPriorDateOnConsummatesQualifiedInitialPublicOffering
Namespace Prefix: | zlab_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrant vesting period. + References No definition available. + Details
Name: | zlab_WarrantVestingPeriod
Namespace Prefix: | zlab_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesAOneATwoBOneBTwoAndCConvertiblePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesAOneConvertiblePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesATwoConvertiblePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesBOneConvertiblePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesBTwoConvertiblePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesCConvertibleRedeemablePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesAOneATwoBOneBTwoConvertiblePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=zlab_SeriesBOneAndBTwoConvertiblePreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |