Entity Central Index Key Cash and cash equivalents accumulated gross unrealized gain before tax. Cash and cash equivalents accumulated gross unrealized loss before tax. Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in marketable security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in marketable security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Document and entity information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Shell Company Entity Shell Company Entity Common Stock Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series A Preferred Units Series A Preferred Stock [Member] Series B Preferred Units Series B Preferred Stock [Member] Series B one preferred units. Series B-1 Preferred Units Series B One Preferred Units [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Marketable securities Available For Sale Securities Debt Securities Current Accounts receivable Accounts Receivable Net Current Inventories Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Deferred financing costs Deferred Offering Costs Total current assets Assets Current Property and equipment – net Property Plant And Equipment Net Other assets Other Assets Noncurrent Total assets Assets Liabilities, Convertible Preferred Units and Stockholders' and Members’ Equity/(Deficit) Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses Accrued Liabilities And Other Liabilities Warrant liability Derivative Liabilities Current Total current liabilities Liabilities Current Noncurrent liabilities: Liabilities Noncurrent [Abstract] Deferred rent Deferred Rent Credit Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 19) Commitments And Contingencies Convertible preferred units: Temporary Equity [Abstract] Total convertible preferred units Redeemable Noncontrolling Interest Equity Preferred Carrying Amount Stockholders'/members' equity/(deficit): Partners Capital [Abstract] Common Units, 0 Units authorized at December 31, 2018 and 600,000,000 at December 31, 2017; 0 Units issued and outstanding at December 31, 2018 and 218,982,140 at December 31, 2017 Limited Partners Capital Account Preferred Stock, par value $0.001 per share; 10,000,000 shares authorized at December 31, 2018 and 0 shares at December 31, 2017; 0 shares issued and outstanding at December 31, 2018 and December 31, 2017 Preferred Stock Value Outstanding Common Stock, par value $0.001 per share; 500,000,000 shares authorized at December 31, 2018 and 0 shares at December 31, 2017; 29,450,035 shares issued and outstanding at December 31, 2018 and 0 at December 31, 2017 Common Stock Value Outstanding Additional paid-in capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders'/members' equity/(deficit) attributable to electroCore, Inc., subsidiaries and affiliate Stockholders Equity Noncontrolling interest Minority Interest Total stockholders'/members' equity/(deficit): Partners Capital Including Portion Attributable To Noncontrolling Interest Total liabilities, convertible preferred units and stockholders' equity/ members' equity Liabilities And Stockholders Equity Preferred Units, authorized Temporary Equity Shares Authorized Preferred Units, issued Temporary Equity Shares Issued Preferred Units, outstanding Temporary Equity Shares Outstanding Common Units, authorized Limited Partners Capital Account Units Authorized Common Units, issued Limited Partners Capital Account Units Issued Common Units, outstanding Limited Partners Capital Account Units Outstanding Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Scenario Statement Scenario [Axis] Scenario, Unspecified Scenario Unspecified [Domain] Electrocore, LLC Predecessor [Member] ElectroCore, Inc Successor [Member] Net sales Revenue From Contract With Customer Excluding Assessed Tax Cost of goods sold Cost Of Goods And Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense Selling, general and administrative Selling General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Other expense/(income) Other Nonoperating Income Expense [Abstract] Loss on extinguishment of debt Gains Losses On Extinguishment Of Debt Interest expense Interest Expense Amortization of debt issuance costs Amortization Of Financing Costs Change in fair value of warrant liability Fair Value Adjustment Of Warrants Change in fair value of derivative instrument related to convertible bridge notes Derivative Gain Loss On Derivative Net Interest and other income, net Interest And Other Income Other expense Other Nonoperating Expense Total other expense/(income) Nonoperating Income Expense Loss before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net loss from operations Profit Loss Less: Net income/(loss) attributable to noncontrolling interest Net Income Loss Attributable To Noncontrolling Interest Net loss attributable to Electrocore subsidiaries and affiliate Net Income Loss Net loss per share of common stock - Basic and Diluted (see Note 11) Earnings Per Share Basic And Diluted Weighted average and potential common shares outstanding - Basic and Diluted (see Note 11) Weighted Average Number Of Share Outstanding Basic And Diluted Statement Of Income And Comprehensive Income [Abstract] Net loss from operations Other comprehensive (loss) income: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Foreign currency translation adjustment Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Amount reclassed from accumulated other comprehensive loss Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Before Tax Unrealized losses on marketable securities, net of taxes as applicable Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Other comprehensive loss Other Comprehensive Income Loss Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Less: Net comprehensive (loss)/income attributable to noncontrolling interest Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive loss attributable to Electrocoe, LLCand electroCore, Inc. subsidiaries and affiliates Comprehensive Income Net Of Tax Profit loss in equity. Temporary equity stock issued during period shares new issues. Stock issued during period value exchange for elimination of preference. Stock issued during period shares exchange for elimination of preference. Stock issued during period value initial funding of units. Reclassification of retained earnings to additional paid in capital. Temporary equity shares conversion of convertible preferred units. Temporary equity value conversion of convertible preferred units. Stock issued during period shares stock dividend. Reclassification of warrant liability to equity. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income [Member] (Deficit)/Equity attributable to Electrocore LLC and electroCore, Inc. subsidiaries and affiliate Parent [Member] Noncontrolling Interest Noncontrolling Interest [Member] Common units, other than profits interests. Common Units Common Units Other Than Profits Interests [Member] Stock Conversion Description Conversion Of Stock By Unique Description [Axis] Conversion of Stock, Name Conversion Of Stock Name [Domain] Conversion Of Series A Preferred Units. Conversion of Series A Preferred Units Conversion Of Series A Preferred Units [Member] Conversion of Series B Preferred Units. Conversion of Series B Preferred Units Conversion Of Series B Preferred Units [Member] Conversion of Members Common Units. Conversion of Member Common Units Conversion Of Members Common Units [Member] Profits interests. Profits Interests Profits Interests [Member] Balances, beginning of period Convertible Preferred Units, beginning of period, shares Convertible Preferred Units Value, beginning of period Common Units, beginning of period, shares Common Stock, beginning of period, shares Net loss Net loss Profit Loss In Equity Reclass of accumulated deficit to APIC Reclassification Of Retained Earnings To Additional Paid In Capital Other comprehensive income Conversion of units to common stock Stock Issued During Period Value Conversion Of Units Temporary equity conversion of units to common stock, shares Temporary Equity Shares Conversion Of Convertible Preferred Units Temporary equity conversion of units to common stock Temporary Equity Value Conversion Of Convertible Preferred Units Conversion of units to common stock, shares Stock Issued During Period Shares Conversion Of Units Stock dividend issued to Series A preferred holders Stock Issued During Period Value Stock Dividend Stock dividend issued to Series A preferred holders, shares Stock Issued During Period Shares Stock Dividend Issuance of stock units, net Stock Issued During Period Value New Issues Issuance of Series B Preferred Units, net, shares, Temporary Equity Temporary Equity Stock Issued During Period Shares New Issues Issuance of Series B Preferred Units, net, Temporary Equity Temporary Equity Stock Issued During Period Value New Issues Issuance of stock, shares Stock Issued During Period Shares New Issues Issuance costs related to initial public offering Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Reclass of warrant liability to equity Reclassification Of Warrant Liability To Equity Noncontrolling interest contributions Minority Interest Period Increase Decrease Noncontrolling interest distributions Minority Interest Decrease From Distributions To Noncontrolling Interest Holders Stock and Unit-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Stock and Unit-based compensation, shares Stock Issued During Period Shares Share Based Compensation Gross Common Units issued in connection with convertible bridge notes, net Stock Issued During Period Value Conversion Of Convertible Securities Common Units issued in connection with convertible bridge notes, net, shares Stock Issued During Period Shares Conversion Of Convertible Securities Common Units issued in exchange for elimination of preference Stock Issued During Period Value Exchange For Elimination Of Preference Common Units issued in exchange for elimination of preference, shares Stock Issued During Period Shares Exchange For Elimination Of Preference Common Units issued for initial funding of Series B Preferred Units Stock Issued During Period Value Initial Funding Of Units Balances, end of period Convertible Preferred Units end of period, shares Convertible Preferred Units Value end of period Common Units, end of period, shares Common Stock, end of period, shares Balances, end of period Stockholders Equity Including Portion Attributable To Noncontrolling Interest Change in fair value of warrants and embedded derivative. Adjustments of Cloud Computing Implementation Cost. Reclassification of warrant liability to additional paid in capital. Reclassification of deferred financing costs to additional paid in capital. Deferred financing costs included in accounts payable and accrued expenses. Non cash or par non cash stock dividend distribution. Capitalized cloud computing arrangement costs included in accounts payable and accrued expenses Warrants issued in connection with convertible bridge notes. Common Warrants issued. Deferred accrued financing costs. Statement Of Cash Flows [Abstract] Common Units Elimination of liquidation preference. Elimination of Liquidation Preference Elimination Of Liquidation Preference [Member] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Amortization of debt discount and debt issuance costs Amortization Of Financing Costs And Discounts Change in fair value of warrants and embedded derivative Change In Fair Value Of Warrants And Embedded Derivative Non-cash interest expense on convertible bridge notes Paid In Kind Interest Stock/unit-based compensation Share Based Compensation Depreciation and amortization Depreciation Depletion And Amortization Net loss on settlement of convertible bridge note Amortization of marketable securities premium/(discount) Accretion Amortization Of Discounts And Premiums Investments Cloud computing arrangement implementation costs Adjustments Of Cloud Computing Implementation Cost Other Other Noncash Income Expense Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Inventories Increase Decrease In Inventories Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable and accrued expenses Increase Decrease In Accounts Payable And Accrued Liabilities Deferred rent Increase Decrease In Prepaid Rent Net cash used in operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Purchase of marketable securities Payments To Acquire Marketable Securities Proceeds from maturities of marketable securities Proceeds From Sale And Maturity Of Marketable Securities Purchases of property and equipment Payments To Acquire Property Plant And Equipment Net cash used in investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Sale of common stock, net of related expenses Proceeds From Issuance Of Common Stock Proceeds from issuance of Series B Preferred Units Proceeds From Issuance Of Convertible Preferred Stock Financing costs related to the issuance of Series B Preferred Units Payments Of Stock Issuance Costs