Document And Entity Information
Expected dividend yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Note To Financial Statement Details Textual
Significant Accounting Policies
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
Note C - Accounts and Other Receivables
Note D - Prepaid Expenses and Other Current Assets
Risk-free interest rate
Note E - Property and Equipment
Note F - Accounts Payable and Accrued Expenses
Note G - Debt Obligations
Note H - Commitments and Contingencies
Note K - Common Stock and Warrants
Note L - Stock-based Compensation
Income Tax Disclosure [Text Block]
Note M - Fair Value of Financial Instruments
Note N - Income Taxes
Note O - Net Loss Per Share
Expected volatility
Note C - Accounts and Other Receivables - Accounts and Other Receivables (Details)
us-gaap_LiabilitiesCurrent
Total current liabilities
Note D - Prepaid Expenses and Other Current Assets - Components of Prepaid Expenses and Other Current Assets (Details)
Schedule of Maturities of Long-term Debt [Table Text Block]
Note E - Property and Equipment - Components of Property and Equipment (Details)
Note E - Property and Equipment - Estimated Useful Lives of Property and Equipment (Details)
Convertible Debt [Table Text Block]
Note F - Accounts Payable and Accrued Expenses - Accounts Payable and Accrued Expenses (Details)
Expected term (in years) (Year)
Other current liabilities
Note G - Debt Obligations - Convertible Notes Outstanding (Details)
Note G - Debt Obligations - Future Minimum Payments (Details)
Note H - Commitments and Contingencies - Lease Cost (Details)
Note H - Commitments and Contingencies - Supplement Cash Flow Information Related to Leases (Details)
Note H - Commitments and Contingencies - Supplement Balance Sheet Information Related to Lease (Details)
Note H - Commitments and Contingencies - Maturities of lease Liabilities (Details)
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Note K - Common Stock and Warrants - Reserved Authorized Shares of Common Stock for Future Issuance (Details)
Note K - Common Stock and Warrants - Common Stock Activity (Details)
Note L - Stock-based Compensation - Stock-based Compensation Expense (Details)
Note L - Stock-based Compensation - Black-Scholes Option-pricing Model (Details)
Note L - Stock-based Compensation - Schedule of Stock Option Activity (Details)
Share-based Payment Arrangement, Option, Activity [Table Text Block]
Note L - Stock-based Compensation - Information Regarding Currently Outstanding and Exercisable Options (Details)
Note L - Stock-based Compensation - Nonvested Stock Option Awards (Details)
Note M - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)
Note M - Fair Value of Financial Instruments - Reconciliation of Beginning and Ending Balances for Derivative and Warrant Liability Measured at Fair Value on Recurring Basis (Details)
Maturities and sales of marketable securities
Note N - Income Taxes - Schedule of Reconciliation of Difference Between Benefit for Income Taxes and Income Taxes at Statutory U.S. Federal Income Tax Rate (Details)
Note N - Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details)
US Treasury Securities [Member]
Note N - Income Taxes - Federal Net Operating Loss Carryforward and Research Activities Credit (Details)
Note O - Net Loss Per Share - Summary of Computation of Basic and Diluted Net Loss and Net Loss Per Share (Details)
Note O - Net Loss Per Share - Anti-dilutive Securities (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
Vested and expected to vest, weighted average remaining contractual term (Year)
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Current portion of capital lease obligation
us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Proceeds from Debt, Net of Issuance Costs
Vested and expected to vest, number of options (in shares)
Vested and expected to vest, weighted average exercise price (in dollars per share)
Exercisable, weighted average exercise price (in dollars per share)
Exercisable, weighted average remaining contractual term (Year)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value
Current portion of convertible notes
Convertible Notes Payable, Current
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Exercisable, number of options (in shares)
Outstanding, weighted average remaining contractual term (Year)
Outstanding, aggregate intrinsic value
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value
Number of unvested shares (in shares)
Retirement Plan Name [Axis]
Retirement Plan Name [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Outstanding, weighted average exercise price (in dollars per share)
Outstanding, weighted average exercise price (in dollars per share)
Accounts payable and accrued expenses
Total accounts payable and accrued expenses
Canceled or forfeited, weighted average exercise price (in dollars per share)
Expired, weighted average exercise price (in dollars per share)
Granted, weighted average exercise price (in dollars per share)
Exercised or released, weighted average exercise price (in dollars per share)
Accrued banking fees
Accrued interest
Accounts payable
Options outstanding, number of shares (in shares)
Outstanding, number of options (in shares)
Outstanding, number of options (in shares)
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
Expired, number of options (in shares)
Credit Facility [Axis]
Credit Facility [Domain]
Other accrued expenses
Accrued payroll
us-gaap_PolicyTextBlockAbstract
Accounting Policies
kmph_BeneficialOwnershipCapLimitPercentage
Beneficial Ownership, Cap Limit, Percentage
Represents the percentage of beneficial ownership less or equal to Cap.
Accrued professional fees
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized
Series A Convertible Preferred Stock [Member]
Represents series A convertible preferred stock.
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
Liabilities and stockholders’ deficit
us-gaap_LossContingencyAccrualAtCarryingValue
Loss Contingency Accrual, Ending Balance
First ATM Agreement [Member]
Represents information related to first ATM agreement.
Weighted average number of shares of common stock outstanding:
us-gaap_Assets
Total assets
Supplemental cash flow information:
us-gaap_LongTermDebtFairValue
Long-term Debt, Fair Value
Preferred Stock [Text Block]
Plan Name [Axis]
Plan Name [Domain]
Compensation and Employee Benefit Plans [Text Block]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
Other Current Assets [Text Block]
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
us-gaap_SubleaseIncome
Less: sublease income
Other prepaid expenses and current assets
Amount of prepaid expenses and current assets classified as other.
Computer and Hardware [Member]
Long-lived, depreciable assets that are used in the creation, maintenance, and utilization of information systems.
Laboratory Equipment [Member]
Tangible laboratory property used to produce good and services.
Share-based Payment Arrangement [Text Block]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Property, Plant and Equipment, Useful Life [Table Text Block]
Tabular disclosure of useful lives of physical assets used in the normal conduct of business and not intended for resale.
Underwriting Public Offering [Member]
Represents information related to underwriting public offering.
ATM Agreement Sales [Member]
Represents for At-the-Market Agreement Sales.
Business Description and Basis of Presentation [Text Block]
Award Type [Domain]
Award Type [Axis]
Net loss
Net loss
Net loss - basic and diluted
us-gaap_OwnshareLendingArrangementSharesIssued
Own-share Lending Arrangement, Shares, Issued
kmph_CapitalLeaseInterestRate
Capital Lease, Interest Rate
The interest rate related to capital leases.
Performance Shares [Member]
Share-based Payment Arrangement [Member]
Convertible Debt Securities [Member]
Warrant [Member]
Second ATM Agreement [Member]
Represents the information pertaining to the Second ATM Agreement.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Antidilutive Securities [Axis]
RBC Capital Markets, LLC [Member]
Represents the information pertaining to RBC Capital Markets, LLC.
Antidilutive Securities, Name [Domain]
Underwriting Agreement [Member]
Represents the information pertaining to the underwriting agreement.
kmph_OperatingAndCapitalLeasesRentExpenseNet
Operating and Capital Leases, Rent Expense, Net
Rental expense for the reporting period incurred under operating and capital leases, including minimum and any contingent rent expense, net of related sublease income.
Exchanged 2021 Notes for Series A Preferred Stock [Member]
Represents the exchange of 2021 notes for series A preferred stock.
kmph_ProceedsFromIssuanceOfCommonStockNet
Proceeds from Issuance of Common Stock, Net
The cash inflow from issuance of common stock, net of cash paid for issuance cost.
kmph_ConvertiblePreferredStockConversionPrice
Convertible Preferred Stock, Conversion Price
The conversion price of convertible preferred stock.
Commitments and Contingencies Disclosure [Text Block]
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Less: accumulated depreciation and amortization
less: accumulated depreciation and amortization
kmph_PreferredStockAggregateStatedValuePerShare
Preferred Stock, Aggregate Stated Value Per Share
The aggregate state value of a preferred stock.
Property and equipment, net
Property and equipment, net
Proceeds from underwritten public offering, net of commissions
The cash inflow from underwritten public offering net of commissions expense.
Convertible Notes 2021 [Member]
Represents information related to conversation 2021 notes.
kmph_ConvertiblePreferredStockSharesIssuableUponConversion
Convertible Preferred Stock, Shares Issuable Upon Conversion
The number of common shares issuable upon the conversion of convertible preferred stock.
Property and equipment, gross
kmph_ConvertiblePreferredStockConversionRestrictionPercentageOfCommonStock
Convertible Preferred Stock, Conversion Restriction, Percentage of Common Stock
The percentage of common stock applied as the restriction for the conversion of preferred stock.
Long-term Debt, Type [Axis]
kmph_ClassOfWarrantOrRightAdditionalSharesExercisableForEachMilestones
Class of Warrant or Right, Additional Shares Exercisable for Each Milestones
The additional number of shares become exercisable when each of the specified milestones achieved.
Long-term Debt, Type [Domain]
Warrant Issued to KVK [Member]
Represents the warrant issued to KVK in connection with a Collaboration and License Agreement.
Series A Preferred Stock Converted Into Common Stock [Member]
Represents the conversion of series A preferred stock to common stock.
KVK [Member]
Represents the information pertaining to KVK Tech, Inc.
kmph_NumberOfManufacturingArrangements
Number of Manufacturing Arrangements
Represents the number of manufacturing arrangements.
kmph_SupplyArrangementExpense
Supply Arrangement Expense
Amount of expense associated with supply arrangement.
kmph_SupplyArrangementAutomaticRenewalPeriod
Supply Arrangement, Automatic Renewal Period
Period for which the supply arrangement automatically renews unless either party to the contract provides prior notice.
kmph_SupplyArrangementPeriodOfPriorNotice
Supply Arrangement, Period of Prior Notice
Period of prior notice to cancel automatic renewal under the supply arrangement.
Cash flows from investing activities:
Net loss per share of common stock:
Earnings Per Share [Text Block]
Convertible Notes Payable [Member]
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accounts payable and accrued expenses
us-gaap_IncomeTaxExpenseBenefit
Income tax benefit
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
kmph_DebtConversionAccruedInterest
Debt Conversion, Accrued Interest
The amount of accrued interest that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.
Conversion from Deerfield Convertible Note to Common Stock [Member]
Represents the conversion from Deerfield convertible note to common stock.
Restricted cash
us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Defined Contribution Plan, Employer Discretionary Contribution Amount
General and administrative
us-gaap_DebtInstrumentSinkingFundPayment
Debt Instrument, Sinking Fund Payment
us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay
Exercise Price Range One [Member]
The exercise price range one.
Cash and cash equivalents
us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Other liabilities
Exercise Price Range Two [Member]
The exercise price range two.
Exercise Price Range Three [Member]
The exercise price range three.
us-gaap_DebtInstrumentConvertibleConversionPrice1
Debt Instrument, Convertible, Conversion Price
Stock based compensation expense
Share-based Payment Arrangement, Expense
Exercise Price Range Four [Member]
The exercise price range four.
Exercise Price Range Five [Member]
The exercise price range five.
us-gaap_DebtInstrumentConvertibleNumberOfEquityInstruments
Debt Instrument, Convertible, Number of Equity Instruments
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Gain on extinguishment of debt
Amendment Flag
Use of Estimates, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
Reclassification, Policy [Policy Text Block]
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding, Ending Balance
Balance (in shares)
Balance (in shares)
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding, Ending Balance
Derivative and warrant liability
Noncurrent Carrying amount of derivative and warrant liability.
Current Fiscal Year End Date
us-gaap_DebtInstrumentInterestRateStatedPercentage
Debt Instrument, Interest Rate, Stated Percentage
Variable lease cost
kmph_EffectiveIncomeTaxRateReconciliationReturnToProvisionAndDeferredTrueup
Return to provision and deferred true-up
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to return to provision and deferred true-up.
us-gaap_LeaseCost
Total lease costs
kmph_EffectiveIncomeTaxRateReconciliationWarrantLiabilitiesIncreaseDecrease
Warrant liability
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in warrant liabilities.
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase (Decrease) in Prepaid Expense and Other Assets, Total
Prepaid expenses and other assets
Operating leases
kmph_DeferredIncomeTaxAssetsLiabilities
Deferred tax assets less liabilities
Amount, before allocation of valuation allowance and after deferred tax liability and deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.
Document Fiscal Period Focus
Operating lease cost
Document Fiscal Year Focus
Short-term lease cost
Lease, Cost [Table Text Block]
us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
Finance leases
Document Period End Date
us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Operating leases
Operating leases (Year)
Entity Ex Transition Period
Entity Emerging Growth Company
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
Document Type
Gain on extinguishment of debt
Gain on extinguishment of debt
us-gaap_AssetImpairmentCharges
Asset Impairment Charges, Total
Entity Small Business
Entity Shell Company
kmph_DeferredOfferingCostsWriteoff
Write-off of deferred offering costs
Specific incremental costs e.g. legal and accounting fees, directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.
Expiration
Expiration year of each operating loss carryforward included in operating loss carryforward.
Document Information [Line Items]
Document Information [Table]
Retirement Plan [Member]
The 401(k) retirement plan covering substantially all employees.
Profit Sharing Plan [Member]
The dicretionary profit sharing plan that covers all employees.
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance as of beginning of period
Balance as of end of period
Entity Public Float
Severance expense
Severance Costs
Entity Filer Category
Debt Instrument [Axis]
Deferred offering costs included in accounts payable and accrued expenses
The specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred including accounts payable and accrued expense during the period.
Entity Current Reporting Status
Debt Instrument, Name [Domain]
Entity Voluntary Filers
Property and equipment included in accounts payable and accrued expenses
Fixed assets included in accounts payable and accrued expenses.
Entity Well-known Seasoned Issuer
Series D Redeemable Convertible Preferred Stock [Member]
Represents Series D Redeemable Convertible Preferred Stock.
kmph_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityCumulativeEffectAdjustment
Adjustment to fair value
Amount of cumulative effect adjustment for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
Deerfield Facility Agreement [Member]
Represents Deerfield Facility Agreement.
us-gaap_CapitalizedContractCostGross
Capitalized Contract Cost, Gross
us-gaap_CapitalizedContractCostAmortization
Capitalized Contract Cost, Amortization
Stock-based compensation expense
us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Accounts and other receivables
Change in fair value of embedded conversion feature in connection with debt modification
Entity Central Index Key
Entity Registrant Name
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Entity [Domain]
Legal Entity [Axis]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Offering expenses charged to equity
Term Notes [Member]
Represents term notes.
us-gaap_AllowanceForDoubtfulAccountsReceivable
Accounts Receivable, Allowance for Credit Loss, Ending Balance
Deerfield Convertible Notes [Member]
Represents the Deerfield Convertible Notes.
Entity Common Stock, Shares Outstanding (in shares)
Deerfield Warrant [Member]
Represents the Deerfield Warrant.
Trading Symbol
The 2021 Notes Converted to Preferred Stock [Member]
Represents the 2021 notes converted to preferred stock.
Conversion of principal and interest on Deerfield Convertible Note
The 2019 Notes Converted to Common Stock [Member]
Represents the 2019 notes converted to common stock.
kmph_DebtInstrumentRepurchasePriceEqualToPercentageOfPrincipalAmount
Debt Instrument Repurchase Price Equal to Percentage of Principal Amount
Amount of debt instrument repurchase price equal to percentage of principal amount.
2021 Notes [Member]
Represents the 2021 notes.
Common stock issued as a result of Convertible Note conversion (in shares)
Stock Issued During Period, Shares, Conversion of Convertible Securities
The 2021 Notes Converted to Common Stock [Member]
Represents the 2021 notes converted to common stock.
us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Line of Credit Facility, Interest Rate at Period End
kmph_LicenseAgreementMaximumPaymentsReceivedForSalesMilestones
License Agreement, Maximum Payments Received for Sales Milestones
The maximum amount of payments received for sales milestones.
Common stock options exercised (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Exercised or released, number of options (in shares)
us-gaap_TableTextBlock
Notes Tables
kmph_LicenseAgreementPrelaunchPaymentReimbursementWithin10DaysOfInitialAdoptionMilestone
License Agreement, Pre-launch Payment Reimbursement Within 10 Days of Initial Adoption Milestone
The amount of pre-launch payment reimbursement withing 10 days of initial adoption milestone.
kmph_LicenseAgreementEstimatedPrelaunchPaymentsAndCostsReimbursements
License Agreement, Estimated Pre-launch Payments and Costs Reimbursements
The amount of estimated reimbursements for pre-launch payments and costs.
Deferred offering costs
Amount of increase (decrease) in additional paid in capital (APIC) resulting from the write-off of deferred offering costs.
us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Maximum Borrowing Capacity
Restricted stock vested during the period (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total
kmph_LicenseAgreementPercentageOfNetSalesOnRollingFourQuarterBasisReceived
License Agreement, Percentage of Net Sales on Rolling Four Quarter Basis Received
The percentage of net sales on a rolling four quarter basis to be received.
Exercise of stock options
Stock Issued During Period, Value, Stock Options Exercised
kmph_OperatingLossCarryforwardsExpirationEndingYear
Operating Loss Carryforwards, Expiration, Ending Year
The expiration year at the end of each operating loss carryforward included in operating loss carryforward.
Series D Redeemable Convertible Preferred Stock Reclassified to Common Stock [Member]
Represents series D redeemable convertible preferred stock reclassified to common stock.
kmph_OperatingLossCarryforwardsExpirationBeginningYear
Operating Loss Carryforwards, Expiration, Beginning Year
The expiration year at the beginning of each operating loss carryforward included in operating loss carryforward.
Finance Lease, Right-of-Use Assets [Member]
Represents finance lease right-of-use assets.
kmph_DebtInstrumentCancellationOfDebtAmount
Debt Instrument, Cancellation of Debt, Amount
Amount of debt instrument cancelled.
kmph_DebtInstrumentPercentageOfAccruedInterestPaid
Debt Instrument, Percentage of Accrued Interest Paid
The percentage of accrued interest paid on debt instrument.
The 2019 Notes [Member]
Represents the 2019 notes.
kmph_DebtInstrumentConvertibleMinimumConversionPrice
Debt Instrument, Convertible, Minimum Conversion Price
The minimum conversion price of debt instrument.
kmph_DebtInstrumentConvertibleConversionRestrictionPercentageOfCommonStock
Debt Instrument, Convertible, Conversion Restriction Percentage of Common Stock
The percentage of common stock applied as the restriction for the conversion of debt instrument.
Granted, number of options (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Canceled or forfeited, number of options (in shares)
kmph_ConversionOfStockMaximumSharesIssued
Conversion of Stock, Maximum Shares Issued
The maximum shares allowed to be issued.
kmph_ClassOfWarrantOrRightIssued
Class of Warrant or Right Issued
Amount of class of warrant or right issued.
2013 Warrants [Member]
Represents the 2013 warrants.
Common stock sold (in shares)
Stock Issued During Period, Shares, New Issues
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' deficit
Issuance of common stock
Optional Exchange Principal Amount Conversion Feature [Member[
Represents the optional exchange principal amount conversion feature.
Accumulated deficit
Research and development
Debt Disclosure [Text Block]
us-gaap_InterestExpense
Interest expense on principal
Change in assets and liabilities:
kmph_AccruedSeveranceExpense
Accrued Severance Expense
The amount of severance expense accrued that is classified as payable.
Schedule of Authorized Shares of Common Stock Reserved for Future Issuance [Table Text Block]
Tabular disclosure of authorized shares of common stock reserved for future issuance.
kmph_SeveranceCharges
Severance Charges
The amount of expenses related to severance during the period.
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
Subsequent Event [Member]
Operating lease liabilities, less current portion
Possible Future Issuances Under Equity Incentive Plans [Member]
Represents possible future issuances under equity incentive plans.
Total operating lease liabilities
Operating Lease, Liability, Total
Non-cash interest expense
Subsequent Event Type [Axis]
Current portion of operating lease liabilities
Subsequent Event Type [Domain]
us-gaap_FinanceLeaseLiabilityCurrent
Other current liabilities
us-gaap_FinanceLeaseLiabilityNoncurrent
Other long-term liabilities
Operating lease right-of-use assets
Operating Lease, Right-of-Use Asset
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments
kmph_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfSharesReservedForIssuanceIncrementalPercentageOfCapitalStockOutstanding
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Reserved for Issuance, Incremental Percentage of Capital Stock Outstanding
Represents the share based compensation arrangement by share based payment award number of shares reserved for issuance incremental percentage of capital stock outstanding.
Financing cash flows from finance leases
Repayment of principal on finance lease liabilities
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less: future interest expense
us-gaap_FinanceLeaseLiability
Lease liabilities
2014 Equity Incentive Plan [Member]
Represents the two thousand fourteen equity incentive plan.
kmph_IncreaseInCommonStockReservedForIssuance
Increase in Common Stock Reserved for Issuance
Amount of increase in common stock reserved for issuance.
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2022
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2023
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
2024
us-gaap_FinanceLeaseRightOfUseAsset
Property and equipment, net
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Thereafter
Fair Value of Financial Instruments, Policy [Policy Text Block]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2020
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2021
Segment Reporting, Policy [Policy Text Block]
us-gaap_PaymentsForRestructuring
Payments for Restructuring
Fundamental Change and Make-Whole Interest Provisions Embedded in 2021 Notes [Member]
Represents fundamental change and make-whole interest provisions embedded in 2021 notes
Deerfield Warrant Liability [Member]
Represents deerfield warrant liability.
Fair value adjustment related to derivative and warrant liability
Fair value adjustment related to derivative and warrant liability
Warrants to Purchase Common Stock [Member]
Represents warrants to purchase common stock.
Other long-term assets
us-gaap_ShareBasedCompensation
Stock-based compensation expense
Deerfield Convertible Note principal and interest converted to common stock
us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Debt Conversion, Converted Instrument, Shares Issued
Earnings Per Share, Policy [Policy Text Block]
Amortization of debt issuance costs and debt discount
Interest expense related to amortization of debt issuance costs and discount
2021 Notes principal converted to preferred stock
Debt Conversion, Original Debt, Amount
kmph_DefinedContributionPlanRequisiteServicePeriod
Defined Contribution Plan, Requisite Service Period
Minimum period employees are required to perform services to become eligible under the defined contribution plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
Embedded Put Option [Member]
Represents an embedded put option.
Debt Conversion Description [Axis]
kmph_ChangeInFairValueOfEmbeddedConversionFeature
Change in Fair Value of Embedded Conversion Feature
Represents the change in fair value of embedded conversion feature.
Debt Conversion, Name [Domain]
Operating expenses:
kmph_RoyaltyRevenuePercent
Royalty Revenue, Percent
Represents the royalty revenue expressed as a percentage.
Income Tax, Policy [Policy Text Block]
Financial assets measured at fair value on recurring basis
kmph_RevenueRecognitionMilestoneMethodAdditionalRevenueToBeRecognized
Revenue Recognition, Milestone Method, Additional Revenue to be Recognized
The amount of additional consideration to be recognized for the milestone or milestones.
kmph_RevenueRecognitionMilestoneMethodRevenueToBeRecognized
Revenue Recognition, Milestone Method, Revenue to be Recognized
The amount of consideration to be recognized for the milestone or milestones.
Reimbursement of Out-of-pocket Third-party Research and Development Costs [Member]
Information pertaining to reimbursement of out-of-pocket third-party research and development costs.
Collaborative Arrangement, Accounting Policy [Policy Text Block]
Consulting Services [Member]
Information pertaining to consulting services.
Optional Exchange Principal Amount [Member]
Information pertaining to the Optional Exchange Principal Amount.
Research and Development Expense, Policy [Policy Text Block]
Common stock issued as a result of Preferred Stock conversion (in shares)
Conversion of Stock, Shares Issued
Depreciation and amortization expense
Depreciation, Depletion and Amortization, Total
Financial liabilities measured at fair value on recurring basis
us-gaap_ConversionOfStockSharesConverted1
Conversion of Stock, Shares Converted
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share
Stock Conversion Description [Axis]
Conversion of Stock, Name [Domain]
us-gaap_AssetsCurrent
Total current assets
kmph_FinanceLeaseCostTotal
Total finance lease cost
Represents total cost of fiance lease.
Share-based Payment Arrangement [Policy Text Block]
kmph_LesseeLeaseRemainingTermOfContract
Lessee, Lease, Remaining Term of Contract
Remaining term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
Stockholders' Equity Note Disclosure [Text Block]
January 2020 Notes [Member]
Represents January 2020 Notes.
Tax Year 2019 [Member]
Common stock, $0.0001 par value, 250,000,000 shares authorized, 36,350,785 shares issued and outstanding as of December 31, 2019; 26,455,352 shares issued and outstanding as of December 31, 2018
Adjustments to reconcile net loss to net cash used in operating activities:
Measurement Frequency [Axis]
Measurement Frequency [Domain]
Fair Value, Recurring [Member]
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Common stock, shares issued (in shares)
Common Stock, Shares, Issued, Total
Certificates of Deposit [Member]
Common stock, par value (in dollars per share)
Schedule of Leases Cash Flow Information [Table Text Block]
Tabular disclosure of leases related to cash flow information.
Revenue from Contract with Customer [Policy Text Block]
Restatement [Axis]
kmph_FinanceLeaseRightofuseAssetGross
Property and equipment, at cost
Gross amount of lessee's right to use underlying asset under finance lease.
Restatement [Domain]
Restatement Adjustment [Member]
Schedule of Leases Balance Sheet Information [Table Text Block]
Tabular disclosure of leases related to balance sheet.
Common shares reserved for future issuance (in shares)
us-gaap_DeferredTaxAssetsValuationAllowance
Valuation allowance
Statistical Measurement [Domain]
Operating cash flows from operating leases
Accumulated Depreciation and Amortization [Member]
Primary financial statement caption encompassing accumulated depreciation and amortization.
Maximum [Member]
Property and Equipment, At Cost [Member]
Primary financial statement caption encompassing property and plant at cost.
Minimum [Member]
Prepaid offering costs
Deferred direct contract acquisition costs
Current Portion of Operating Lease Liabilities [Member]
Primary financial statement caption encompassing current portion of operating lease liabilities.
Product and Service [Axis]
Operating cash flows from short-term leases
Operating Lease Right-of-Use Assets [Member]
Primary financial statement caption encompassing operating lease right-of-use assets.
Product and Service [Domain]
Operating cash flows from variable lease costs
Statistical Measurement [Axis]
Operating cash flows from finance leases
Property and Equipment, Net [Member]
Primary financial statement caption encompassing property and equipment, net.
us-gaap_PreferredStockLiquidationPreference
Preferred Stock, Liquidation Preference Per Share
Operating and Finance Lease, Liability, Maturity [Table Text Block]
Tabular disclosure of undiscounted cash flows of operating and finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating and finance lease liability recognized in statement of financial position.
Debt, Policy [Policy Text Block]
Preferred stock
Operating Lease Liabilities, Less Current Portion [Member]
Primary financial statement caption encompassing operating lease liabilities, less current portion.
us-gaap_DeferredTaxAssetsLiabilitiesNet
Net deferred tax asset (liability)
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued, Total
Intangible Assets, Finite-Lived, Policy [Policy Text Block]
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activities
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
us-gaap_DeferredTaxAssetsOther
Other deferred tax assets
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant and Equipment [Table Text Block]
us-gaap_DeferredTaxAssetsGross
Total gross deferred tax assets
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
us-gaap_DeferredIncomeTaxLiabilities
Total gross deferred tax liabilities
kmph_LesseeLeaseOptionToTerminateTerm
Lessee, Lease, Option to Terminate, Term
Represent s the terms of option to terminate lessee's lease.
kmph_LesseeLeaseOptionToExtendMaximumTerm
Lessee, Lease, Option to Extend, Maximum Term
Represents maximum terms of option to extend lessee's lease.
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Prepaid insurance
Revenue
Revenue from Contract with Customer, Including Assessed Tax
Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy and NAV [Domain]
kmph_SaleOfSecuritiesValueAvailableToIssue
Sale of Securities, Value, Available to Issue
The maximum agreed upon value of securities available for issuance, including, but not limited to, common stock, preferred stock, debt, and/or warrants.
Fair Value, Inputs, Level 1 [Member]
kmph_DebtIssuanceCostsAndDiscountGross
Less: debt issuance costs and discounts
Less: debt issuance costs and discounts
Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Also includes the amount of discount applied to the debt.
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
Property and equipment, useful lives (Year)
Property, Plant and Equipment, Useful Life
Cash flows from operating activities:
Accounts and other receivables
Total accounts and other receivables
Statement [Line Items]
Property and equipment financed under a lease agreement
PP&E acquired through lease financing.
Accounts receivable
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Furniture and Fixtures [Member]
Marketable securities
Additional paid-in capital
Stockholders' deficit:
Leasehold Improvements [Member]
Property, Plant and Equipment, Policy [Policy Text Block]
Property, Plant and Equipment, Type [Axis]
us-gaap_NonoperatingIncomeExpense
Total other (expense) income
Property, Plant and Equipment, Type [Domain]
us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Net operating loss carryforwards
Chief Executive Officer [Member]
Other (expense) income:
Research Activities Tax Credit
Research and development tax carryforward
Fair Value Disclosures [Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash, beginning of year
Cash, cash equivalents and restricted cash, end of year
Assets
IPO [Member]
License [Member]
kmph_DebtCovenantDebtFinancingRestriction
Debt Covenant, Debt Financing Restriction
The maximum amount of aggregate debt financing that an entity is restricted from entering into under a debt agreement.
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net (decrease) increase in cash, cash equivalents and restricted cash
us-gaap_Liabilities
Total liabilities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by financing activities
Commitments and contingencies (Note H)
Sale of Stock [Axis]
Sale of Stock [Domain]
Severance Expense [Member]
Primary financial statement caption encompassing severance expense.
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
us-gaap_OperatingIncomeLoss
Loss from operations
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash used in operating activities
us-gaap_DeferredTaxLiabilitiesOther
Other deferred tax liabilities
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Total prepaid expenses and other current assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by investing activities
Conversion From Deerfield Convertible Note to Common and Preferred Stock Member
Amount of original convertible note converted to both common and preferred stock.
kmph_SaleOfStockAuthorizedOfferingPrice
Sale of Stock, Authorized Offering Price
Authorized offering price in a sale of stock transaction.
us-gaap_CostOfGoodsAndServicesSold
Cost of Goods and Services Sold, Total
kmph_ReimbursementOfDebtHolders
Reimbursement of Debt Holders
Reimbursement amount owed to holders of company's debt.
Counterparty Name [Axis]
Counterparty Name [Domain]
Cowen and Company, LLC [Member]
The entity Cowen and Company, LLC, which is the Company's stock sales agent.
kmph_SaleOfStockCommissionFee
Sale of Stock, Commission Fee
The commission fee payable to an offering sales agent. Expressed as a percentage of the gross sales proceeds of any common stock sold.
Series B-1 Convertible Preferred Stock [Member]
Represents information about Series B-1 Convertible Preferred Stock.
Accounting Standards Update 2016-02 [Member]
Marketable Securities, Policy [Policy Text Block]
Type of Adoption [Domain]
us-gaap_PaymentsOfStockIssuanceCosts
Payment of deferred offering costs
Concentration Risk, Credit Risk, Policy [Policy Text Block]
us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Property and equipment
Adjustments for New Accounting Pronouncements [Axis]
Interest and other income, net
Series B-2 Convertible Preferred Stock [Member]
Represents information about Series B-1 Convertible Preferred Stock.
us-gaap_CostsAndExpenses
Total operating expenses
Scenario [Domain]
Forecast [Member]
Possible Future Issuances under the Prior Purchase Agreement [Member]
Represents possible future issuances under the prior purchase agreement.
kmph_SaleOfSecuritiesValueRemainingAvailableToIssue
Sale of Securities, Value, Remaining Available to Issue
The current available maximum agreed upon value of securities available for issuance, including, but not limited to, common stock, preferred stock, debt, and/or warrants.
GPC Member
GPC License Agreement.
2021NotesConvertedToSeriesB1PreferredStockMember
Amount of 2021 notes principal converted to Series B-1 Preferred Stock.
Retained Earnings [Member]
2021NotesConvertedToCommonStockMember
Value of 2021 note principal converted to common stock.
Undesignated Preferred Stock [Member]
Preferred stock that has been classified as undesignated.
Proceeds from exercise of common stock options
Exchanged2021NotesForCommonStockMember
Exchange price, per share of common stock, available to debt holders to exchange a portion of the Optional Exchange Principal Amount for shares of common stock.
Proceeds from at-the-market offering, net of commissions
Proceeds from Issuance of Common Stock
Exchanged2021NotesForSeriesB2PreferredStockMember
Exchange price (per share) offered to Debt Holders for optional exchange of note principal for preferred stock.
Title of Individual [Domain]
kmph_Debtconversionoptiontoexchangeamount
DebtConversionOptionToExchangeAmount
Amount of principal on 2021 notes payable that Debt Holders have option to exchange.
Title of Individual [Axis]
us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
State and Local Income Tax Expense (Benefit), Continuing Operations, Total
Scenario [Axis]
Commitment shares issued in connection with equity line of credit included in deferred offering costs
Represents the amount of commitment shares issued in connection with equity line of credit included in deferred offering costs.
kmph_ConversionOfStockSharesIssuableIfConverted
Conversion Of Stock Shares Issuable If Converted
Shares of common stock issuable upon conversion of the Series B-1 preferred Stock.
Royalty and direct contract acquisition costs
Represents the amount of royalty and direct contract acquisition costs.
Additional Paid-in Capital [Member]
Royalty and Direct Contract Acquisition Costs [Member]
Represents information about royalty and direct contract acquisition costs.
Common Stock [Member]
Preferred Stock [Member]
us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Income Tax Examination, Penalties and Interest Accrued, Total
KVK Warrant Liability [Member]
Represents information related to KVK warrant liability.
Equity Components [Axis]
Equity Component [Domain]
Series B-1 Preferred Convertible Stock Converted to Common Stock [Member]
Series B-1 Preferred Convertible Stock Converted to Shares of Common Stock.
Accounts Payable and Accrued Liabilities [Member]
us-gaap_LongTermDebt
Convertible notes, net
kmph_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRateTaxCreditResearchPercent
Federal research and development credit
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to federal research tax credit.
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Class of Warrant or Right, Exercise Price of Warrants or Rights
kmph_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxesTaxCreditResearchPercent
State research and development credit
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit) attributable to research tax credit.
Class of Warrant or Right [Axis]
Other Current Liabilities [Member]
Class of Warrant or Right [Domain]
Other Noncurrent Liabilities [Member]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total
Loss before income taxes
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Number of Securities Called by Warrants or Rights
us-gaap_PaymentsOfDebtIssuanceCosts
Payment of debt issuance costs
State and Local Jurisdiction [Member]
us-gaap_DeferredRevenue
Deferred Revenue, Total
Income Tax Authority [Axis]
Income Tax Authority [Domain]
us-gaap_RepaymentsOfLongTermDebt
Repayments of Long-term Debt, Total
us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Repayment of obligations under capital lease
Cash and Cash Equivalents, Policy [Policy Text Block]
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Receivable [Policy Text Block]
Convertible notes
Total minimum principal payments
General and Administrative Expense [Member]
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]
us-gaap_OpenTaxYear
Open Tax Year
Entity Interactive Data Current
Title of 12(b) Security
Research and Development Expense [Member]
Tax Year 2017 [Member]
Tax Year 2018 [Member]
Tax Year 2013 [Member]
Tax Year 2014 [Member]
Income Statement Location [Axis]
Tax Year 2015 [Member]
Income Statement Location [Domain]
Tax Year 2016 [Member]
Tax Year 2009 [Member]
Tax Year 2010 [Member]
Tax Year 2011 [Member]
Tax Year 2012 [Member]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Tax Period [Domain]
Collaborative Arrangement Disclosure [Text Block]
Tax Year 2007 [Member]
Tax Year 2008 [Member]
Tax Period [Axis]
Basic and diluted (in shares)
Weighted average number of shares of common stock - basic and diluted (in shares)
Antidilutive securities (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Basic and diluted (in dollars per share)
Net loss per share - basic and diluted (in dollars per share)
Net Operating Loss Carryforwards
Operating Loss Carryforwards, Total
Proceeds from equity line of credit
Asset Class [Axis]
us-gaap_ProceedsFromSecuredNotesPayable
Proceeds from Secured Notes Payable
Summary of Operating Loss Carryforwards [Table Text Block]
Asset Class [Domain]
Statement [Table]
Statement of Financial Position [Abstract]
us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
Other
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Federal income tax provision effective rate
us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Change in rate
us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in valuation allowance
Statement of Cash Flows [Abstract]
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2020
us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2021
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]
Accrued severance
Interest on lease liabilities
us-gaap_FinanceLeaseLiabilityPaymentsDue
Total lease payments
Amortization of right-of-use assets
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive
2024
us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive
Thereafter
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount
Less: future interest expense
us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
2020
us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo
2021
us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree
2022
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour
2023
us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Stock-based compensation
Operating lease liabilities
The increase (decrease) in the operating lease liabilities on the Company's balance sheet.
us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortization
Amortization
Type of Restructuring [Domain]
Finance leases
Employee Severance [Member]
Restructuring and Related Activities Disclosure [Text Block]
us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
State tax benefit (net of federal)
Restructuring Type [Axis]
Finance leases (Year)
Cash flows from financing activities:
Schedule of Common Stock Outstanding Roll Forward [Table Text Block]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Other long-term liabilities
us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Federal statutory rate
Preferred Class A [Member]
Series A Preferred Stock [Member]
Series B Preferred Stock [Member]
kmph_IncreaseDecreaseInOperatingLeaseRightofuseAsset
Operating lease right-of-use assets
The amount of increase (decrease) in operating lease right-of-use assets.
Total stockholders' deficit
Balance
Balance
Equity Line of Credit [Member]
Related to the Equity Line of Credit.
Capital lease obligation, less current portion
Class of Stock [Axis]
Class of Stock [Domain]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Embedded Deerfield Note Put Option [Member]
Represents the embedded Deerfield note put option.
Lincoln Park [Member]
Represents information pertaining to Lincoln Park Capital Fund, LLC.
kmph_SaleOfSecuritiesCoveredUnderProspectusSupplementValueAnticipatedSalesUnderPurchaseAgreement
Sale of Securities Covered Under Prospectus Supplement, Value, Anticipated Sales Under Purchase Agreement
Represents the anticipated sales under a purchase agreement in connection with a prospectus supplement related to the registration statement on Form S-3.
Upper range (in dollars per share)
kmph_PurchaseAgreementAdditionalSharesToBeIssuedAsCommitmentShares
Purchase Agreement, Additional Shares to Be Issued as Commitment Shares
Represents the number of additional shares to be issued under a purchase agreement as commitment shares.
kmph_PurchaseAgreementTerm
Purchase Agreement, Term
Represents the term of a purchase agreement.
Convertible notes, less current portion, net
Other receivables
Exercise Price Range [Axis]
Exercise Price Range [Domain]
Lower range (in dollars per share)