3.26.1 html 390 444 1 false 115 0 false 9 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://belitebio.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://belitebio.com/role/StatementConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 995200105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://belitebio.com/role/StatementConsolidatedBalanceSheetsParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Sheet http://belitebio.com/role/StatementConsolidatedStatementsOfOperationsAndComprehensiveLoss CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Statements 4 false false R5.htm 995200205 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) Sheet http://belitebio.com/role/StatementConsolidatedStatementsOfOperationsAndComprehensiveLossParenthetical CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) Statements 5 false false R6.htm 995200300 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Sheet http://belitebio.com/role/StatementConsolidatedStatementsOfShareholdersEquity CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY Statements 6 false false R7.htm 995200400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://belitebio.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 7 false false R8.htm 995200405 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Sheet http://belitebio.com/role/StatementConsolidatedStatementsOfCashFlowsParenthetical CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Statements 8 false false R9.htm 995210101 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION Sheet http://belitebio.com/role/DisclosureOrganizationAndBasisOfPresentation ORGANIZATION AND BASIS OF PRESENTATION Notes 9 false false R10.htm 995210201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Notes 10 false false R11.htm 995210301 - Disclosure - CASH AND CASH EQUIVALENTS Sheet http://belitebio.com/role/DisclosureCashAndCashEquivalents CASH AND CASH EQUIVALENTS Notes 11 false false R12.htm 995210401 - Disclosure - AVAILABLE-FOR-SALE INVESTMENTS Sheet http://belitebio.com/role/DisclosureAvailableForSaleInvestments AVAILABLE-FOR-SALE INVESTMENTS Notes 12 false false R13.htm 995210501 - Disclosure - HELD-TO-MATURITY INVESTMENTS Sheet http://belitebio.com/role/DisclosureHeldToMaturityInvestments HELD-TO-MATURITY INVESTMENTS Notes 13 false false R14.htm 995210601 - Disclosure - OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS Sheet http://belitebio.com/role/DisclosureOtherReceivablesPrepaymentsAndOtherCurrentAssetsPrepaymentsAndOtherNonCurrentAssets OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS Notes 14 false false R15.htm 995210701 - Disclosure - HELD-TO-MATURITY DEBT SECURITIES Sheet http://belitebio.com/role/DisclosureHeldToMaturityDebtSecurities HELD-TO-MATURITY DEBT SECURITIES Notes 15 false false R16.htm 995210801 - Disclosure - PROPERTY AND EQUIPMENT, NET Sheet http://belitebio.com/role/DisclosurePropertyAndEquipmentNet PROPERTY AND EQUIPMENT, NET Notes 16 false false R17.htm 995210901 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Sheet http://belitebio.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilities ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES Notes 17 false false R18.htm 995211001 - Disclosure - SHARE-BASED COMPENSATION Sheet http://belitebio.com/role/DisclosureShareBasedCompensation SHARE-BASED COMPENSATION Notes 18 false false R19.htm 995211101 - Disclosure - LEASES Sheet http://belitebio.com/role/DisclosureLeases LEASES Notes 19 false false R20.htm 995211201 - Disclosure - INCOME TAX Sheet http://belitebio.com/role/DisclosureIncomeTax INCOME TAX Notes 20 false false R21.htm 995211301 - Disclosure - AUSTRALIA RESEARCH AND DEVELOPMENT TAX INCENTIVE Sheet http://belitebio.com/role/DisclosureAustraliaResearchAndDevelopmentTaxIncentive AUSTRALIA RESEARCH AND DEVELOPMENT TAX INCENTIVE Notes 21 false false R22.htm 995211401 - Disclosure - EQUITY Sheet http://belitebio.com/role/DisclosureEquity EQUITY Notes 22 false false R23.htm 995211501 - Disclosure - NET LOSS PER SHARE Sheet http://belitebio.com/role/DisclosureNetLossPerShare NET LOSS PER SHARE Notes 23 false false R24.htm 995211601 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://belitebio.com/role/DisclosureRelatedPartyTransactions RELATED PARTY TRANSACTIONS Notes 24 false false R25.htm 995211701 - Disclosure - SEGMENT Sheet http://belitebio.com/role/DisclosureSegment SEGMENT Notes 25 false false R26.htm 995211801 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://belitebio.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 26 false false R27.htm 995211901 - Disclosure - SUBSEQUENT EVENTS Sheet http://belitebio.com/role/DisclosureSubsequentEvents SUBSEQUENT EVENTS Notes 27 false false R28.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 28 false false R29.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 29 false false R30.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 30 false false R31.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 31 false false R32.htm 99920202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 32 false false R33.htm 99930103 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION (Tables) Sheet http://belitebio.com/role/DisclosureOrganizationAndBasisOfPresentationTables ORGANIZATION AND BASIS OF PRESENTATION (Tables) Tables http://belitebio.com/role/DisclosureOrganizationAndBasisOfPresentation 33 false false R34.htm 99930203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) Tables http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPolicies 34 false false R35.htm 99930303 - Disclosure - CASH AND CASH EQUIVALENTS (Tables) Sheet http://belitebio.com/role/DisclosureCashAndCashEquivalentsTables CASH AND CASH EQUIVALENTS (Tables) Tables http://belitebio.com/role/DisclosureCashAndCashEquivalents 35 false false R36.htm 99930403 - Disclosure - AVAILABLE-FOR-SALE INVESTMENTS (Tables) Sheet http://belitebio.com/role/DisclosureAvailableForSaleInvestmentsTables AVAILABLE-FOR-SALE INVESTMENTS (Tables) Tables http://belitebio.com/role/DisclosureAvailableForSaleInvestments 36 false false R37.htm 99930603 - Disclosure - OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS (Tables) Sheet http://belitebio.com/role/DisclosureOtherReceivablesPrepaymentsAndOtherCurrentAssetsPrepaymentsAndOtherNonCurrentAssetsTables OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS (Tables) Tables http://belitebio.com/role/DisclosureOtherReceivablesPrepaymentsAndOtherCurrentAssetsPrepaymentsAndOtherNonCurrentAssets 37 false false R38.htm 99930803 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables) Sheet http://belitebio.com/role/DisclosurePropertyAndEquipmentNetTables PROPERTY AND EQUIPMENT, NET (Tables) Tables http://belitebio.com/role/DisclosurePropertyAndEquipmentNet 38 false false R39.htm 99930903 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables) Sheet http://belitebio.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables) Tables http://belitebio.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilities 39 false false R40.htm 99931003 - Disclosure - SHARE-BASED COMPENSATION (Tables) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationTables SHARE-BASED COMPENSATION (Tables) Tables http://belitebio.com/role/DisclosureShareBasedCompensation 40 false false R41.htm 99931103 - Disclosure - LEASES (Tables) Sheet http://belitebio.com/role/DisclosureLeasesTables LEASES (Tables) Tables http://belitebio.com/role/DisclosureLeases 41 false false R42.htm 99931203 - Disclosure - INCOME TAX (Tables) Sheet http://belitebio.com/role/DisclosureIncomeTaxTables INCOME TAX (Tables) Tables http://belitebio.com/role/DisclosureIncomeTax 42 false false R43.htm 99931403 - Disclosure - EQUITY (Tables) Sheet http://belitebio.com/role/DisclosureEquityTables EQUITY (Tables) Tables http://belitebio.com/role/DisclosureEquity 43 false false R44.htm 99931503 - Disclosure - NET LOSS PER SHARE (Tables) Sheet http://belitebio.com/role/DisclosureNetLossPerShareTables NET LOSS PER SHARE (Tables) Tables http://belitebio.com/role/DisclosureNetLossPerShare 44 false false R45.htm 99931603 - Disclosure - RELATED PARTY TRANSACTIONS (Tables) Sheet http://belitebio.com/role/DisclosureRelatedPartyTransactionsTables RELATED PARTY TRANSACTIONS (Tables) Tables http://belitebio.com/role/DisclosureRelatedPartyTransactions 45 false false R46.htm 99931703 - Disclosure - SEGMENT (Tables) Sheet http://belitebio.com/role/DisclosureSegmentTables SEGMENT (Tables) Tables http://belitebio.com/role/DisclosureSegment 46 false false R47.htm 99940101 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION (Details) Sheet http://belitebio.com/role/DisclosureOrganizationAndBasisOfPresentationDetails ORGANIZATION AND BASIS OF PRESENTATION (Details) Details http://belitebio.com/role/DisclosureOrganizationAndBasisOfPresentationTables 47 false false R48.htm 99940102 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION - Liquidity (Details) Sheet http://belitebio.com/role/DisclosureOrganizationAndBasisOfPresentationLiquidityDetails ORGANIZATION AND BASIS OF PRESENTATION - Liquidity (Details) Details 48 false false R49.htm 99940201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measurements (Details) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesFairValueMeasurementsDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measurements (Details) Details 49 false false R50.htm 99940202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Receivables (Details) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesOtherReceivablesDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Receivables (Details) Details 50 false false R51.htm 99940203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred offering costs (Details) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDeferredOfferingCostsDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred offering costs (Details) Details 51 false false R52.htm 99940204 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and equipment (Details) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and equipment (Details) Details 52 false false R53.htm 99940205 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Long-lived asset impairment (Details) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesLongLivedAssetImpairmentDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Long-lived asset impairment (Details) Details 53 false false R54.htm 99940207 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Representative's Warrants (Details) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesRepresentativeSWarrantsDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Representative's Warrants (Details) Details 54 false false R55.htm 99940208 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of risks (Details) Sheet http://belitebio.com/role/DisclosureSummaryOfSignificantAccountingPoliciesConcentrationOfRisksDetails SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of risks (Details) Details 55 false false R56.htm 99940301 - Disclosure - CASH AND CASH EQUIVALENTS (Details) Sheet http://belitebio.com/role/DisclosureCashAndCashEquivalentsDetails CASH AND CASH EQUIVALENTS (Details) Details http://belitebio.com/role/DisclosureCashAndCashEquivalentsTables 56 false false R57.htm 99940401 - Disclosure - AVAILABLE-FOR-SALE INVESTMENTS - Available For Sale (Details) Sheet http://belitebio.com/role/DisclosureAvailableForSaleInvestmentsAvailableForSaleDetails AVAILABLE-FOR-SALE INVESTMENTS - Available For Sale (Details) Details 57 false false R58.htm 99940501 - Disclosure - HELD-TO-MATURITY INVESTMENTS - (Details) Sheet http://belitebio.com/role/DisclosureHeldToMaturityInvestmentsDetails HELD-TO-MATURITY INVESTMENTS - (Details) Details http://belitebio.com/role/DisclosureHeldToMaturityInvestments 58 false false R59.htm 99940601 - Disclosure - OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS - Other receivables (Details) Sheet http://belitebio.com/role/DisclosureOtherReceivablesPrepaymentsAndOtherCurrentAssetsPrepaymentsAndOtherNonCurrentAssetsOtherReceivablesDetails OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS - Other receivables (Details) Details http://belitebio.com/role/DisclosureOtherReceivablesPrepaymentsAndOtherCurrentAssetsPrepaymentsAndOtherNonCurrentAssetsTables 59 false false R60.htm 99940602 - Disclosure - OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS - Prepayments and other current assets (Details) Sheet http://belitebio.com/role/DisclosureOtherReceivablesPrepaymentsAndOtherCurrentAssetsPrepaymentsAndOtherNonCurrentAssetsPrepaymentsAndOtherCurrentAssetsDetails OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS - Prepayments and other current assets (Details) Details 60 false false R61.htm 99940603 - Disclosure - OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS - Prepayments and other non-current assets (Details) Sheet http://belitebio.com/role/DisclosureOtherReceivablesPrepaymentsAndOtherCurrentAssetsPrepaymentsAndOtherNonCurrentAssetsPrepaymentsAndOtherNonCurrentAssetsDetails OTHER RECEIVABLES, PREPAYMENTS AND OTHER CURRENT ASSETS, PREPAYMENTS AND OTHER NON - CURRENT ASSETS - Prepayments and other non-current assets (Details) Details 61 false false R62.htm 99940701 - Disclosure - HELD-TO-MATURITY DEBT SECURITIES (Details) Sheet http://belitebio.com/role/DisclosureHeldToMaturityDebtSecuritiesDetails HELD-TO-MATURITY DEBT SECURITIES (Details) Details http://belitebio.com/role/DisclosureHeldToMaturityDebtSecurities 62 false false R63.htm 99940801 - Disclosure - PROPERTY AND EQUIPMENT, NET (Details) Sheet http://belitebio.com/role/DisclosurePropertyAndEquipmentNetDetails PROPERTY AND EQUIPMENT, NET (Details) Details http://belitebio.com/role/DisclosurePropertyAndEquipmentNetTables 63 false false R64.htm 99940901 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) Sheet http://belitebio.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesDetails ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) Details http://belitebio.com/role/DisclosureAccruedExpensesAndOtherCurrentLiabilitiesTables 64 false false R65.htm 99941001 - Disclosure - SHARE-BASED COMPENSATION - Plans (Details) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationPlansDetails SHARE-BASED COMPENSATION - Plans (Details) Details 65 false false R66.htm 99941002 - Disclosure - SHARE-BASED COMPENSATION - Fair value assumptions (Details) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationFairValueAssumptionsDetails SHARE-BASED COMPENSATION - Fair value assumptions (Details) Details 66 false false R67.htm 99941003 - Disclosure - SHARE-BASED COMPENSATION - Stock option activity (Details) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationStockOptionActivityDetails SHARE-BASED COMPENSATION - Stock option activity (Details) Details 67 false false R68.htm 99941004 - Disclosure - SHARE-BASED COMPENSATION - Compensation expense (Details) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationCompensationExpenseDetails SHARE-BASED COMPENSATION - Compensation expense (Details) Details 68 false false R69.htm 99941005 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Units - Assumptions (Details) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationRestrictedStockUnitsAssumptionsDetails SHARE-BASED COMPENSATION - Restricted Stock Units - Assumptions (Details) Details 69 false false R70.htm 99941006 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Units (Details) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationRestrictedStockUnitsDetails SHARE-BASED COMPENSATION - Restricted Stock Units (Details) Details 70 false false R71.htm 99941007 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Units - Summary of RSUs activity (Details) Sheet http://belitebio.com/role/DisclosureShareBasedCompensationRestrictedStockUnitsSummaryOfRsusActivityDetails SHARE-BASED COMPENSATION - Restricted Stock Units - Summary of RSUs activity (Details) Details 71 false false R72.htm 99941101 - Disclosure - LEASES - (Details) Sheet http://belitebio.com/role/DisclosureLeasesDetails LEASES - (Details) Details 72 false false R73.htm 99941102 - Disclosure - LEASES - Balance sheet information related to leases (Details) Sheet http://belitebio.com/role/DisclosureLeasesBalanceSheetInformationRelatedToLeasesDetails LEASES - Balance sheet information related to leases (Details) Details 73 false false R74.htm 99941103 - Disclosure - LEASES - Minimum lease payments in future periods (Details) Sheet http://belitebio.com/role/DisclosureLeasesMinimumLeasePaymentsInFuturePeriodsDetails LEASES - Minimum lease payments in future periods (Details) Details 74 false false R75.htm 99941201 - Disclosure - INCOME TAX - Rates (Details) Sheet http://belitebio.com/role/DisclosureIncomeTaxRatesDetails INCOME TAX - Rates (Details) Details 75 false false R76.htm 99941202 - Disclosure - INCOME TAX - Pretax loss (Details) Sheet http://belitebio.com/role/DisclosureIncomeTaxPretaxLossDetails INCOME TAX - Pretax loss (Details) Details 76 false false R77.htm 99941203 - Disclosure - INCOME TAX - Income tax expense (Details) Sheet http://belitebio.com/role/DisclosureIncomeTaxIncomeTaxExpenseDetails INCOME TAX - Income tax expense (Details) Details 77 false false R78.htm 99941204 - Disclosure - INCOME TAX - Tax rate to provision reconciliation (Details) Sheet http://belitebio.com/role/DisclosureIncomeTaxTaxRateToProvisionReconciliationDetails INCOME TAX - Tax rate to provision reconciliation (Details) Details 78 false false R79.htm 99941205 - Disclosure - INCOME TAX - Deferred income tax (Details) Sheet http://belitebio.com/role/DisclosureIncomeTaxDeferredIncomeTaxDetails INCOME TAX - Deferred income tax (Details) Details 79 false false R80.htm 99941206 - Disclosure - INCOME TAX - Changes in valuation allowance (Details) Sheet http://belitebio.com/role/DisclosureIncomeTaxChangesInValuationAllowanceDetails INCOME TAX - Changes in valuation allowance (Details) Details 80 false false R81.htm 99941207 - Disclosure - INCOME TAX - Uncertain tax positions (Details) Sheet http://belitebio.com/role/DisclosureIncomeTaxUncertainTaxPositionsDetails INCOME TAX - Uncertain tax positions (Details) Details 81 false false R82.htm 99941301 - Disclosure - AUSTRALIA RESEARCH AND DEVELOPMENT TAX INCENTIVE (Details) Sheet http://belitebio.com/role/DisclosureAustraliaResearchAndDevelopmentTaxIncentiveDetails AUSTRALIA RESEARCH AND DEVELOPMENT TAX INCENTIVE (Details) Details http://belitebio.com/role/DisclosureAustraliaResearchAndDevelopmentTaxIncentive 82 false false R83.htm 99941401 - Disclosure - EQUITY - Ordinary Shares (Details) Sheet http://belitebio.com/role/DisclosureEquityOrdinarySharesDetails EQUITY - Ordinary Shares (Details) Details 83 false false R84.htm 99941402 - Disclosure - EQUITY - ATM offering (Details) Sheet http://belitebio.com/role/DisclosureEquityAtmOfferingDetails EQUITY - ATM offering (Details) Details 84 false false R85.htm 99941403 - Disclosure - EQUITY - Direct offering (Details) Sheet http://belitebio.com/role/DisclosureEquityDirectOfferingDetails EQUITY - Direct offering (Details) Details 85 false false R86.htm 99941404 - Disclosure - EQUITY - Underwriting public offering (Details) Sheet http://belitebio.com/role/DisclosureEquityUnderwritingPublicOfferingDetails EQUITY - Underwriting public offering (Details) Details 86 false false R87.htm 99941405 - Disclosure - EQUITY - Representative Warrants (Details) Sheet http://belitebio.com/role/DisclosureEquityRepresentativeWarrantsDetails EQUITY - Representative Warrants (Details) Details 87 false false R88.htm 99941406 - Disclosure - EQUITY - Follow-on warrants (Details) Sheet http://belitebio.com/role/DisclosureEquityFollowOnWarrantsDetails EQUITY - Follow-on warrants (Details) Details 88 false false R89.htm 99941407 - Disclosure - EQUITY - Registered direct offering warrants (Details) Sheet http://belitebio.com/role/DisclosureEquityRegisteredDirectOfferingWarrantsDetails EQUITY - Registered direct offering warrants (Details) Details 89 false false R90.htm 99941408 - Disclosure - EQUITY - Inducement warrants (Details) Sheet http://belitebio.com/role/DisclosureEquityInducementWarrantsDetails EQUITY - Inducement warrants (Details) Details 90 false false R91.htm 99941409 - Disclosure - EQUITY - PIPE warrants (Details) Sheet http://belitebio.com/role/DisclosureEquityPipeWarrantsDetails EQUITY - PIPE warrants (Details) Details 91 false false R92.htm 99941410 - Disclosure - EQUITY - Model variables (Details) Sheet http://belitebio.com/role/DisclosureEquityModelVariablesDetails EQUITY - Model variables (Details) Details 92 false false R93.htm 99941411 - Disclosure - EQUITY - Warrants activities (Details) Sheet http://belitebio.com/role/DisclosureEquityWarrantsActivitiesDetails EQUITY - Warrants activities (Details) Details 93 false false R94.htm 99941501 - Disclosure - NET LOSS PER SHARE - Calculation of Basic and diluted net loss per share (Details) Sheet http://belitebio.com/role/DisclosureNetLossPerShareCalculationOfBasicAndDilutedNetLossPerShareDetails NET LOSS PER SHARE - Calculation of Basic and diluted net loss per share (Details) Details 94 false false R95.htm 99941502 - Disclosure - NET LOSS PER SHARE - Anti-dilutive securities (Details) Sheet http://belitebio.com/role/DisclosureNetLossPerShareAntiDilutiveSecuritiesDetails NET LOSS PER SHARE - Anti-dilutive securities (Details) Details 95 false false R96.htm 99941601 - Disclosure - RELATED PARTY TRANSACTIONS (Details) Sheet http://belitebio.com/role/DisclosureRelatedPartyTransactionsDetails RELATED PARTY TRANSACTIONS (Details) Details http://belitebio.com/role/DisclosureRelatedPartyTransactionsTables 96 false false R97.htm 99941602 - Disclosure - RELATED PARTY TRANSACTIONS - Balances (Details) Sheet http://belitebio.com/role/DisclosureRelatedPartyTransactionsBalancesDetails RELATED PARTY TRANSACTIONS - Balances (Details) Details 97 false false R98.htm 99941603 - Disclosure - RELATED PARTY TRANSACTIONS - Transactions (Details) Sheet http://belitebio.com/role/DisclosureRelatedPartyTransactionsTransactionsDetails RELATED PARTY TRANSACTIONS - Transactions (Details) Details 98 false false R99.htm 99941701 - Disclosure - SEGMENT - Financial Information including significant segment expenses (Details) Sheet http://belitebio.com/role/DisclosureSegmentFinancialInformationIncludingSignificantSegmentExpensesDetails SEGMENT - Financial Information including significant segment expenses (Details) Details 99 false false R100.htm 99941801 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://belitebio.com/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://belitebio.com/role/DisclosureCommitmentsAndContingencies 100 false false All Reports Book All Reports blte-20251231.xsd blte-20251231_cal.xml blte-20251231_def.xml blte-20251231_lab.xml blte-20251231_pre.xml blte-20251231x20f.htm blte-20251231x20f002.jpg blte-20251231x20f003.jpg blte-20251231x20f004.jpg blte-20251231x20f006.jpg blte-20251231x20f007.jpg blte-20251231x20f008.jpg blte-20251231x20f009.jpg blte-20251231x20f010.jpg blte-20251231x20f011.jpg blte-20251231x20f012.jpg blte-20251231x20f014.jpg blte-20251231x20f017.jpg blte-20251231x20f018.jpg blte-20251231x20f019.jpg blte-20251231x20f027.jpg http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true