Document and entity information. Document And Entity Information [Abstract] Document Information [Table] Document Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus CONSOLIDATED BALANCE SHEETS Statement [Table] Statement [Table] Statement [Line Items] Statement Assets [Abstract] Assets Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Due from Related Parties, Current Amounts due from subsidiaries and VIEs Time deposits represent deposits placed with banks with original maturities more than three months but less than one year. Time Deposits in Bank Time deposit Short-term Investments Short-term investments Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful receivables of US$1,478 and US$1,507 as of December 31, 2017 and 2018, respectively Accounts receivable, net Accounts receivable, net Rebates receivable Rebates receivable Prepaid Advertising Prepaid media costs Other Assets, Current Other assets Other assets, Current Other current assets Income Taxes Receivable, Current Income tax receivable Assets, Current Total current assets Assets, Noncurrent [Abstract] Non-current assets Deferred Income Tax Assets, Net Deferred tax assets Property, Plant and Equipment, Net Long-lived assets Property and equipment, net Property and equipment, net Long-term Investments Long-term investment Equity Method Investments Investment in an equity investee Investments in subsidiaries and VIEs Finite-Lived Intangible Assets, Net Intangible assets, net Intangible assets Goodwill Goodwill Other Assets, Noncurrent Other assets Other assets, Non-current Other non-current assets Assets, Noncurrent Total non-current assets Assets Total assets Total assets Liabilities and Equity [Abstract] Liabilities and equity Liabilities, Current [Abstract] Current liabilities Accounts payable Accounts payable (including accounts payable of the consolidated variable interest entity ("VIE") and its subsidiaries without recourse to the Company of US$29 and US$45 as of December 31, 2017 and 2018, respectively) Accounts payable of the consolidated variable interest entity ("VIE") and its subsidiary without recourse to the Company Contract with Customer, Liability, Current Balance at the end of the year Balance at the beginning of the year Deferred revenue, current Deferred revenue Deferred revenue (including deferred revenue of the consolidated VIE and its subsidiaries without recourse to the Company of US$5,986 and US$1,300 as of December 31, 2017 and 2018, respectively) Deferred revenue Amount of expenses incurred but not yet paid nor invoiced, and liabilities classified as other. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued liabilities and other current liabilities Accrued liabilities and other current liabilities Accrued liabilities and other current liabilities (including accrued liabilities and other current liabilities of the consolidated VIE and its subsidiaries without recourse to the Company of US$804 and US$1,776 as of December 31, 2017 and 2018, respectively) Accrued liabilities and other current liabilities Accrued liabilities and other current liabilities of the Line of Credit, Current Bank borrowings Convertible Notes Payable, Current Convertible notes at fair value Accrued Income Taxes, Current Income tax payable Liabilities, Current Total current liabilities Liabilities, Noncurrent [Abstract] Non-current liabilities Non-current liability Other Liabilities, Noncurrent Other liabilities Deferred Income Tax Liabilities, Net Deferred tax liabilities Liabilities, Noncurrent Total non-current liabilities Liabilities Total Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Stockholders' Equity Attributable to Parent [Abstract] Equity Common Stock, Value, Issued Ordinary shares Treasury Stock, Common, Value Treasury shares Treasury shares (2,123,382 and 1,363,860 shares as of December 31, 2017 and 2018, respectively) Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings, Appropriated Statutory reserves Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive losses Retained Earnings, Unappropriated Accumulated deficit Retained Earnings (Accumulated Deficit) Other shareholders' equity Stockholders' Equity Attributable to Parent Ending balance Beginning balance Total iClick Interactive Asia Group Limited shareholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Non-controlling interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance Total equity Liabilities and Equity Total liabilities and shareholders' equity Total liabilities and equity Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Ordinary Shares - Class A Common Class B [Member] Ordinary Shares - Class B Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Variable Interest Entity Primary Beneficiary [Member] VIE Allowance for Doubtful Accounts Receivable, Current Less: allowance for doubtful accounts Balance at the end of year Balance at the beginning of year Accounts receivable, allowance for doubtful receivables Common Stock, Par or Stated Value Per Share Ordinary shares, par value Common Stock, Shares Authorized Ordinary shares, shares authorized Common Stock, Shares, Issued Ordinary shares, shares issued Common Stock, Shares, Outstanding Ending balance, shares Beginning balance, shares Ordinary shares, shares outstanding Treasury Stock, Common, Shares Treasury stock, shares CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Revenue from Contract with Customer, Excluding Assessed Tax Net revenues Cost of Goods and Services Sold Cost of revenues Gross Profit Gross profit Gross profit Operating Expenses [Abstract] Operating expenses Research and Development Expense Research and development expenses Selling and Marketing Expense Sales and marketing expenses General and Administrative Expense General and administrative expenses General and administrative expenses Operating Expenses Total operating expenses Total operating expenses Operating Income (Loss) Operating loss Operating loss Interest Income, Deposits with Financial Institutions Interest income Interest Expense Interest expense Other Nonoperating Gains (Losses) Other gains/(losses), net Total Other (losses)/gains, net Fair Value Adjustment of Warrants Fair value gains/(losses) on derivative liabilities Fair value (gains)/losses on derivative liabilities Amount of fair value loss on convertible notes. Fair Value Losses on Convertible Notes Fair value losses on convertible notes Fair value loss on convertible notes Income loss from subsidiaries and variable interest entities. Income Loss From Subsidiaries And Variable Interest Entities Loss from subsidiaries and VIEs Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before income tax expense Loss before income tax expense Income Tax Expense (Benefit) Income tax expense Income tax expense Income tax expense Income tax expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net loss Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to non-controlling interest Net Income (Loss) Attributable to Parent Net loss attributable to iClick Interactive Asia Group Limited Temporary Equity, Accretion to Redemption Value, Adjustment Accretion to redeemable shares redemption value Accretion to redeemable shares redemption value Net Income (Loss) Available to Common Stockholders, Basic Numerator of basic net loss per share Net loss attributable to iClick Interactive Asia Group Limited's ordinary shareholders Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive loss: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation Foreign currency translation adjustment, net of tax Foreign currency translation adjustment, net of US$nil tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss attributable to iClick Interactive Asia Group Limited Comprehensive loss attributable to iClick Interactive Asia Group Limited Earnings Per Share, Basic and Diluted [Abstract] Net loss per share attributable to iClick Interactive Asia Group Limited Numerator: Earnings Per Share, Basic - Basic Basic net loss per share attributable to iClick Interactive Asia Group Limited Earnings Per Share, Diluted - Diluted Diluted net loss per share attributable to iClick Interactive Asia Group Limited Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of ordinary shares used in per share calculation: Weighted Average Number of Shares Outstanding, Basic - Basic Weighted Average Number of Shares Outstanding, Diluted - Diluted Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Foreign currency translation adjustment, tax Statement of Stockholders' Equity [Abstract] Stock Issued During Period, Value, Share-based Compensation, Gross Reissuance of treasury shares as share-based compensation Stock Issued During Period, Shares, Share-based Compensation, Gross Reissuance of treasury shares as share-based compensation, shares Stock Issued During Period, Value, Stock Options Exercised Reissuance of treasury shares upon exercise of employee share options and vesting of restricted share units ("RSUs") Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Reissuance of treasury shares upon exercise of employee share options and vesting of restricted share units ("RSUs"), shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation expense Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures RSUs vested Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures RSUs vested, in shares Temporary Equity, Accretion to Redemption Value Preferred shares accretion Accretion to redemption value Derecognition of Derivative Liabilities Derecognition of derivative liabilities Stock Issued During Period, Value, New Issues Issuance of ordinary shares upon Initial public offering ("IPO") Stock Issued During Period, Shares, New Issues Shares issued during period (in shares) Shares issued (in shares) Issuance of ordinary shares Issuance of ordinary shares upon Initial public offering ("IPO"), shares Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of preferred shares to Class A ordinary shares Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of preferred shares to Class A ordinary shares Conversion of preferred shares to Class A ordinary shares (in shares) Stock Issued During Period, Value, Acquisitions Business combination Stock Repurchased During Period, Value Repurchase of ordinary shares Stock Repurchased During Period, Shares Repurchase of ordinary shares, shares Preferred Stock Redemption Premium Deemed contribution upon repurchase of Series B-1 preferred shares Stock Issued During Period, Shares, Treasury Stock Reissued Reissuance of treasury shares upon acquisition of Buzzinate Company Limited, shares Shares transferred from treasury shares (in shares) Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by/(used in) operating activities Depreciation Depreciation expense Depreciation of property and equipment Amortization of Intangible Assets Amortization expense Amortization of intangible assets Gain (Loss) on Disposition of Property Plant Equipment Loss on disposal of property and equipment Business Combination, Bargain Purchase, Gain Recognized, Amount Gain on bargain purchase Gain on bargain purchase (Note 21) Gain on bargain purchase Provision for Doubtful Accounts Additions for the year Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Recoveries Recoveries Recovery of doubtful debts previously provided for Share-based Compensation Share-based compensation The amounts pertaining to convertible notes transaction expenses. Convertible Notes Transaction Expenses Convertible notes transaction expenses Deferred Income Taxes and Tax Credits Deferred tax Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, net Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Prepaid Expense and Other Assets Prepayments and other assets Increase (Decrease) in Accrued Liabilities Accrued liabilities and other current liabilities Increase (Decrease) in Deferred Revenue Deferred revenue Increase Decrease In Rebates Receivable Rebates receivables Increase (Decrease) in Prepaid Advertising Prepaid media costs Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Income Taxes Payable Income tax payable Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash provided by operating activities Net cash used in operating activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash flows from investing activities The cash outflow associated with the prepayment for acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Prepayment Of Property, Plant, and Equipment Prepayment of property and equipment Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Payments to Acquire Intangible Assets Purchase of intangible assets Payments for (Proceeds from) Short-term Investments Decrease/(increase) in short-term investments Payments to Acquire Long-term Investments Increase in long-term investment The net amount paid (received) by the reporting entity through acquisition or sale and maturities of time deposits. Payments for (Proceeds from) Time Deposits (Increase)/decrease in time deposit Payments to Acquire Businesses, Net of Cash Acquired Acquisition of business, net of cash received Settlement of purchase consideration payable Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net cash provided by/(used in) investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from financing activities Cash flows from financing activities: Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of shares Proceeds from issuance of Series E convertible redeemable preferred shares Proceeds from Stock Options Exercised Proceeds from exercise of share options Proceeds from Bank Debt Proceeds from bank borrowings Repayments of Bank Debt Repayments of bank borrowings Repayments of Related Party Debt Repayment of amounts due to related parties The cash inflow associated with the amount received from entity's first offering of stock to the public, net of offering costs. Proceeds from Issuance Initial Public Offering, Net of Offering Costs Net proceeds from issuance of ordinary shares upon IPO Proceeds from Convertible Debt Proceeds from issuance of convertible notes, net of transaction expenses Proceeds from issuance of convertible notes Payments for Repurchase of Common Stock Repurchase of ordinary shares Aggregate consideration for ADS repurchased Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net increase in cash and cash equivalents and restricted cash Net increase/(decrease) in cash and cash equivalents and restricted cash Net increase/(decrease) in cash and cash equivalents and restricted cash in the consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents and restricted cash at the end of year Cash and cash equivalents and restricted cash at the beginning of year Cash and cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Effect on exchange rate changes on cash and cash equivalents and restricted cash Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information: Interest Paid Interests paid Income Taxes Paid, Net Cash refunded/(paid) for income taxes Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash investing and financing activities: Initial Public Offering Expenses In Form Of Other Payables Initial Public Offering Expenses In Form Of Other Payables IPO costs in form of other payables This concept does not have any references. Reconciliation of Cash and Cash Equivalents and Restricted Cash [Abstract] Reconciliation of cash and cash equivalents and restricted cash within the consolidated balance sheets to the amounts shown in the consolidated statements of cash flows above: Restricted Cash, Current Restricted cash, current Organization and principal activities Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization and principal activities Principal accounting policies Significant Accounting Policies [Text Block] Principal accounting policies Certain risks and concentration Concentration Risk Disclosure [Text Block] Certain risks and concentration Business acquisition