Document And Entity Information
Note To Financial Statement Details Textual
Significant Accounting Policies
Note E - Preferred Stock and Warrants
Note F - Common Stock and Warrants
Note G - Stock-based Compensation
Note H - Fair Value of Financial Instruments
Note I - Net Income (Loss) Per Share
Note K - Leases
Note E - Preferred Stock and Warrants - Preferred Stock Issued and Outstanding (Details)
Note F - Common Stock and Warrants - Reserved Authorized Shares of Common Stock for Future Issuance (Details)
Note F - Common Stock and Warrants - Common Stock Activity (Details)
Note G - Stock-based Compensation - Stock-based Compensation Expense (Details)
Note H - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details)
Note H - Fair Value of Financial Instruments - Reconciliation of Beginning and Ending Balances for Derivative and Warrant Liability Measured at Fair Value on Recurring Basis (Details)
Note I - Net Income (Loss) Per Share - Anti-dilutive Securities (Details)
us-gaap_LiabilitiesCurrent
Total current liabilities
Note I - Net Income (Loss) Per Share - Anti-dilutive Securities (Details) (Parentheticals)
Note I - Net Income (Loss) Per Share - Earnings Per Share (Details)
Note K - Leases - Lease Cost (Details)
Other current liabilities
Note K - Leases - Supplement Cash Flow Information Related to Leases (Details)
Note K - Leases - Supplement Balance Sheet Information Related to Lease (Details)
Note K - Leases - Maturities of lease Liabilities (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Proceeds from Debt, Net of Issuance Costs
Current portion of loans payable
us-gaap_ConvertibleNotesPayableCurrent
Convertible Notes Payable, Current
kmph_DebtInstrumentConvertibleOptionalConversionFeatureSharesIssuableUponExchange
Debt Instrument, Convertible Optional Conversion Feature Shares Issuable Upon Exchange (in shares)
The amount of shares issuable upon exchange from convertible optional conversion features in a debt instrument.
kmph_MaximumPercentOfCommonStockOwnershipAllowedPerHolderUponWarrantExercise
Maximum Percent of Common Stock Ownership Allowed Per Holder Upon Warrant Exercise
The maximum percent of common stock ownership allowed per holder upon warrant exercise.
Financial Instruments [Domain]
kmph_MaximumPercentOfCommonStockOwnershipAllowedPerHolderAfterWarrantExerciseUponHoldersSelection
Maximum Percent of Common Stock Ownership Allowed Per Holder After Warrant Exercise Upon Holders Selection
The maximum percent of common stock ownership allowed per holder after warrant exercise upon holders selection.
kmph_PreferredStockSharesAuthorizedEliminated
Preferred Stock, Shares Authorized, Elimated (in shares)
The number of preferred shares authorized that were eliminated during the period.
June 2021 Inducement Warrants [Member]
Represents the June 2021 inducement warrants.
Exchange Warrants [Member]
Related to exchange warrants.
Public Offering Warrants [Member]
Related to public offering warrants.
kmph_SharesAndWarrantsIssuedPricePerShare
Shares and Warrants Issued, Price Per Share (in dollars per share)
The price per share of shares and warrants issued.
Accounts payable and accrued expenses
Underwriter Warrants [Member]
The underwriter warrants.
kmph_OverAllotmentOptionsNumberOfSharesForWarrants
Over Allotment Options, Number of Shares for Warrants (in shares)
The number of shares for warrants in over allotment options.
Financial Instrument [Axis]
kmph_PlacementAgentFeePercentage
Placement Agent Fee, Percentage
The percentage amount of the placement agent fee.
JMP and RBCCM [Member]
Represents JMP Securities LLC ("JMP") and RBC Capital Markets, LLC ("RBCCM").
January 2021 Inducement Warrants [Member]
Related to January 2021 inducement warrants.
kmph_WarrantsIssuedUponExchangePercentageOfSharesIssuedUponExercise
Warrants Issued Upon Exchange, Percentage of Shares Issued Upon Exercise
The warrants issued upon exchange, a percent of shares issued upon exercise.
kmph_EquityDistributionAgreementMaximumAggregateOfferingPrice
Equity Distribution Agreement, Maximum Aggregate Offering Price
The maximum aggregate offering price under the equity distribution agreement.
kmph_ClassOfWarrantPurchasePricePerWarrant
Class of Warrant, Purchase Price Per Warrant (in dollars per share)
The price per warrant of warrant purchases.
kmph_EquityDistributionAgreementCommissionFeePercentageOfGrossSales
Equity Distribution Agreement, Commission Fee, Percentage of Gross Sales
The percentage of gross sales for commission fee under the equity distribution agreement.
Amounts due for property and equipment included in accounts payable and accrued expenses
Credit Facility [Axis]
Credit Facility [Domain]
us-gaap_PolicyTextBlockAbstract
Accounting Policies
kmph_BeneficialOwnershipCapLimitPercentage
Beneficial Ownership, Cap Limit, Percentage
Represents the percentage of beneficial ownership less or equal to Cap.
Dilutive effect of warrant (in shares)
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
Dilutive effect of awards under equity incentive plans (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)
Series A Convertible Preferred Stock [Member]
Represents series A convertible preferred stock.
Liabilities and stockholders' equity (deficit)
us-gaap_LossContingencyAccrualAtCarryingValue
Loss Contingency Accrual, Ending Balance
Weighted average number of shares of common stock outstanding:
Operating lease liabilities
Supplemental cash flow information:
us-gaap_Assets
Total assets
us-gaap_LongTermDebtFairValue
Long-term Debt, Fair Value
Preferred Stock [Text Block]
Plan Name [Axis]
Plan Name [Domain]
us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net (loss) income attributable to common stockholders
Net (loss) income attributable to common stockholders
us-gaap_SubleaseIncome
Less: sublease income
Undistributed net (loss) income attributable to common stockholders, diluted
Share-based Payment Arrangement [Text Block]
us-gaap_PreferredStockDividendsAndOtherAdjustments
Preferred Stock Dividends and Other Adjustments, Total
Deemed dividend
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
us-gaap_ContractWithCustomerAssetNet
Contract with Customer, Asset, after Allowance for Credit Loss, Total
ATM Agreement Sales [Member]
Represents for At-the-Market Agreement Sales.
Business Description and Basis of Presentation [Text Block]
Award Type [Domain]
us-gaap_PreferredStockDividendsIncomeStatementImpact
Less: Dividends declared or accumulated
Award Type [Axis]
Net loss
Net loss
Net income (loss)
Net income (loss)
Performance Shares [Member]
Share-based Payment Arrangement [Member]
Convertible Debt Securities [Member]
Warrant [Member]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Antidilutive Securities [Axis]
us-gaap_PreferredStockConvertibleSharesIssuable
Preferred Stock, Convertible, Shares Issuable (in shares)
Antidilutive Securities, Name [Domain]
us-gaap_PreferredStockConvertibleConversionPrice
Preferred Stock, Convertible, Conversion Price (in dollars per share)
Underwriting Agreement [Member]
Represents the information pertaining to the underwriting agreement.
Commitments and Contingencies Disclosure [Text Block]
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
less: accumulated depreciation and amortization
Property and equipment, net
Proceeds from Public Offering, net of discounts and commissions
The cash inflow from underwritten public offering net of commissions expense.
Long-term Debt, Type [Axis]
kmph_ClassOfWarrantOrRightAdditionalSharesExercisableForEachMilestones
Class of Warrant or Right, Additional Shares Exercisable for Each Milestones (in shares)
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.
KVK [Member]
Represents the information pertaining to KVK Tech, Inc.
kmph_LicenseAgreementEstimatedPreLaunchPaymentsAndReimbursements
License Agreement, Estimated Pre-launch Payments and Reimbursements
The estimated amount of pre-launch payments and reimbursements pursuant to the license agreement.
Undistributed net (loss) income attributable to common stockholders, basic
us-gaap_UndistributedEarningsLossAvailableToCommonShareholdersBasic
kmph_LicenseAgreementPercentageOfNetProfits
License Agreement, Percentage of Net Profits
The percentage of net profits will be received by the company pursuant to the license agreement.
us-gaap_UndistributedEarnings
Undistributed net income (loss), basic
kmph_LicenseAgreementAdditionalPaymentsUponAchievementOfSalesMilestone
License Agreement, Additional Payments Upon Achievement of Sales Milestone
The additional payments will pay by the counter party upon achievement of specified the sales milestone.
us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Less: Net income attributable to participating securities
Cash flows from investing activities:
Earnings Per Share [Text Block]
kmph_ClassOfWarrantsOrRightExercisedDuringPeriod
Class of Warrants or Right, Exercised During Period (in shares)
The number of warrants or rights exercised during period.
Convertible Notes Payable [Member]
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accounts payable and accrued expenses
us-gaap_IncomeTaxExpenseBenefit
Income tax benefit (expense)
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Conversion of Facility Notes into Series B-2 Preferred Stock [Member]
Represents the conversion of the Facility Notes into series B-2 preferred stock.
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.
kmph_AdjustmentsToAdditionalPaidInCapitalDeemedDividends
Deemed dividend related the Inducement Transaction
Amount of decrease in additional paid in capital (APIC) resulting from the deemed dividends
Issuance of common stock in connection with the exercise of warrants
Value of stock issued during the period for exercises of warrants.
kmph_OverAllotmentOptionsPercentageOfCommonStockOutstandingForWarrants
Over Allotment Options, Percentage of Common Stock Outstanding for Warrants
The percentage of common stock outstanding to be issued for warrants to purchase common stock under the over allotment option.
Aquestive Therapeutics [Member]
Represents Aquestive Therapeutics (formerly known as MonoSol Rx, LLC).
kmph_ConsultingAgreementConditionalMilestoneAchievementToBeReceived
Consulting Agreement, Conditional Milestone Achievement to be Received
The amount to be received upon conditional milestone achievement under the consulting agreement.
Conversion from Deerfield Convertible Note to Common Stock [Member]
Represents the conversion from Deerfield convertible note to common stock.
Corium, Inc [Member]
Represents Corium, Inc.
kmph_ConsultingAgreementMaximumAmountToBeReceived
Consulting Agreement, Maximum Amount to be Received
The maximum amount to be received under the consulting agreement.
General and administrative
us-gaap_DebtInstrumentSinkingFundPayment
Debt Instrument, Sinking Fund Payment
Cash and cash equivalents
us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Other liabilities
us-gaap_DebtInstrumentConvertibleConversionPrice1
Debt Instrument, Convertible, Conversion Price (in dollars per share)
Stock based compensation expense
Share-based Payment Arrangement, Expense
Fair value of warrants issued to underwriters in connection with Public Offering
The fair value of warrants issued during the period.
us-gaap_RoyaltyExpense
Royalty Expense
Amendment Flag
City Area Code
Use of Estimates, Policy [Policy Text Block]
New Accounting Pronouncements, Policy [Policy Text Block]
Warrants Issued in Connection with January 2021 Inducement Transaction [Member]
Information related to the warrants issued in connection with January 2021 Inducement Transaction.
Warrants Issued in Connection with June 2021 Inducement Transaction [Member]
Information related to the warrants issued in connection with June 2021 Inducement Transaction.
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding, Ending Balance (in shares)
Balance (in shares)
Balance (in shares)
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding, Ending Balance (in shares)
Schedule of Preferred Stock [Table Text Block]
Tabular disclosure of preferred stock.
Possible Future Issuances Under Employee Stock Purchase Plans [Member]
Represents possible future issuances under employee stock purchase plans.
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
us-gaap_LeaseCost
Total lease costs
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and other assets
Operating leases
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 (years) (Year)
Entity File Number
Entity Emerging Growth Company
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
Document Type
Gain (loss) on extinguishment of debt
Loss on extinguishment of debt
Entity Small Business
Entity Shell Company
kmph_DeferredOfferingCostsWriteoff
Change in estimated 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.
Document Information [Line Items]
Document Information [Table]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance as of beginning of period
Balance as of end of period
Severance expense
Entity Filer Category
Debt Instrument [Axis]
Amounts due for 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]
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.
Less: Fair value adjustment income related to embedded Warrant Put Option
After tax amount of expense (income) related to adjustment to fair value of put option.
Less: Fair value adjustment income related to warrant liability
After tax amount of expense (income) related to adjustment to fair value of warrant liability.
Fair value of warrants issued
Stock-based compensation expense
us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Accounts and other receivables
Entity Tax Identification Number
Entity Central Index Key
Entity Registrant Name
Liability Class [Axis]
Fair Value by Liability Class [Domain]
Entity [Domain]
Legal Entity [Axis]
Entity Address, Address Line One
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Offering expenses charged to equity
Entity Address, City or Town
Entity Address, Postal Zip Code
Term Notes [Member]
Represents term notes.
Entity Address, State or Province
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
kmph_SaleOfStockAuthorizedAmount
Sale of Stock, Authorized Amount
Amount of stock authorized for sale.
Basic net income (loss) per share of common stock (in dollars per share)
kmph_EarningsPerShareBasicBeforeDeemedDividend
Net income (loss) (in dollars per share)
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period, before deemed dividend.
kmph_StockIssuedDuringPeriodSharesReverseStockSplitsAdjustmentForFractionalShare
Adjustment for cash paid in lieu on DTC fractional shares (in shares)
Adjustment for fractional shares during the period as a result of a reverse stock split.
Deerfield Warrant [Member]
Represents the Deerfield Warrant.
Trading Symbol
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.
Issuance of stock as a result of conversion
us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Line of Credit Facility, Interest Rate at Period End
Local Phone Number
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (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.
Change in estimated 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
us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares)
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 (in dollars per share)
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.
kmph_ConversionOfStockMaximumSharesIssued
Conversion of Stock, Maximum Shares Issued (in shares)
The maximum shares allowed to be issued.
us-gaap_WarrantsAndRightsOutstandingTerm
Warrants and Rights Outstanding, Term (Year)
kmph_ClassOfWarrantOrRightIssuedDuringPeriod
Class of Warrant or Right Issued (in shares)
The number of warrants or rights issued during period.
Common stock issued as a result of the Public Offering (in shares)
Stock Issued During Period, Shares, New Issues (in shares)
Issuance of common stock in exchange for consulting services
us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Common stock issued as compensation to third-parties (in shares)
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' equity (deficit)
Issuance of common stock in connection with Public Offering, net of discounts and commissions
Stock Issued During Period, Value, New Issues
us-gaap_DerivativeLiabilityMeasurementInput
Derivative Liability, Measurement Input
Optional Exchange Principal Amount Conversion Feature [Member[
Represents the optional exchange principal amount conversion feature.
Research and development
Accumulated deficit
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
Lease liabilities, operating leases
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
Subsequent Events [Text Block]
Operating lease right-of-use assets
Total operating lease right-of-use assets
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total lease payments, operating leases
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, operating leases
us-gaap_FinanceLeaseLiability
Lease liabilities, finance leases
2014 Equity Incentive Plan [Member]
Represents the two thousand fourteen equity incentive plan.
kmph_IncreaseInCommonStockReservedForIssuance
Increase in Common Stock Reserved for Issuance (in shares)
Amount of increase in common stock reserved for issuance.
Measurement Input Type [Axis]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2024, operating leases
Measurement Input Type [Domain]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2025, operating leases
us-gaap_FinanceLeaseRightOfUseAsset
Property and equipment, net
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2022, operating leases
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2023, operating leases
Deerfield Warrant Liability [Member]
Represents deerfield warrant liability.
us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1
Debt Conversion, Converted Instrument, Warrants or Options Issued (in shares)
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.
us-gaap_ShareBasedCompensation
Stock-based compensation expense
Other long-term assets
us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Debt Conversion, Converted Instrument, Shares Issued (in shares)
2021 (excluding the three months ended March 31, 2021), operating leases
Amortization of debt issuance costs and debt discount
Interest expense related to amortization of debt issuance costs and discount
Notes principal converted
Debt Conversion, Original Debt, Amount
Embedded Put Option [Member]
Represents an embedded put option.
Debt Conversion Description [Axis]
Debt Conversion, Name [Domain]
Operating expenses:
kmph_RoyaltyRevenuePercent
Royalty Revenue, Percent
Represents the royalty revenue expressed as a percentage.
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.
Consulting Services [Member]
Information pertaining to consulting services.
Optional Exchange Principal Amount [Member]
Information pertaining to the Optional Exchange Principal Amount.
us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Stockholders' Equity Note, Stock Split, Conversion Ratio
Common stock issued as a result of Series B-2 Preferred Stock conversions (in shares)
Conversion of Stock, Shares Issued (in shares)
Financial liabilities measured at fair value on recurring basis
Financial and Nonfinancial Liabilities, Fair Value Disclosure
Depreciation and amortization expense
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars 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.
Stockholders' Equity Note Disclosure [Text Block]
kmph_LesseeLeaseRemainingTermOfContract
Lessee, Lease, Remaining Term of Contract (Year)
Remaining term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.
January 2020 Note [Member]
Represents information regarding January 2020 Note.
Lease Disclosure [Text Block]
The entire disclosure for operating, finance, sale leaseback leases.
Common stock, $0.0001 par value, 250,000,000 shares authorized, 34,977,923 shares issued and outstanding as of June 30, 2021 (unaudited); 4,537,321 shares issued and outstanding as of December 31, 2020
Measurement Frequency [Axis]
Adjustments to reconcile net loss to net cash used in operating activities:
Measurement Frequency [Domain]
Fair Value, Recurring [Member]
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized (in shares)
Common stock, shares issued (in shares)
Common Stock, Shares, Issued, Total (in shares)
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share (in dollars per share)
Reverse Stock Split [Member]
The conversion of a reverse stock split where there is a reduction in the shares outstanding.
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]
kmph_FinanceLeaseRightofuseAssetGross
Property and equipment, at cost
Gross amount of lessee's right to use underlying asset under finance lease.
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)
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]
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.
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.
Undesignated preferred stock, $0.0001 par value, 10,000,000 shares authorized, no shares issued or outstanding as of June 30, 2021 (unaudited); 9,961,846 shares authorized, no shares issued or outstanding as of December 31, 2020
Operating Lease Liabilities, Less Current Portion [Member]
Primary financial statement caption encompassing operating lease liabilities, less current portion.
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued, Total (in shares)
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activities
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized (in shares)
kmph_LesseeLeaseOptionToTerminateTerm
Lessee, Lease, Option to Terminate, Term (Year)
Represents the terms of option to terminate lessee's lease.
kmph_LesseeLeaseOptionToExtendMaximumTerm
Lessee, Lease, Option to Extend, Maximum Term (Year)
Represents maximum terms of option to extend lessee's lease.
Preferred stock, par value (in dollars per share)
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]
Fair Value, Inputs, Level 2 [Member]
Fair Value Hierarchy and NAV [Axis]
Cash flows from operating activities:
Accounts and other receivables
Statement [Line Items]
us-gaap_AccountsReceivableNetCurrent
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Additional paid-in capital
Stockholders’ equity (deficit):
us-gaap_NonoperatingIncomeExpense
Total other income (expense)
Other income (expense):
Restricted cash
Fair Value Disclosures [Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash, beginning of period
Cash, cash equivalents and restricted cash, end of period
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 increase in cash, cash equivalents and restricted cash
Over-Allotment Option [Member]
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by financing activities
us-gaap_Liabilities
Total liabilities
Commitments and contingencies (Note D)
Sale of Stock [Axis]
Sale of Stock [Domain]
Severance Expense [Member]
Primary financial statement caption encompassing severance expense.
us-gaap_OperatingIncomeLoss
Income (loss) from operations
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Contract with Customer, Liability, Revenue Recognized
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
Prepaid expenses and other current assets
Counterparty Name [Axis]
Counterparty Name [Domain]
Series B-1 Convertible Preferred Stock [Member]
Represents information about Series B-1 Convertible Preferred Stock.
us-gaap_PaymentsOfStockIssuanceCosts
Payment of offering costs
Series B-2 Convertible Preferred Stock [Member]
Represents information about Series B-1 Convertible Preferred Stock.
us-gaap_CostsAndExpenses
Total operating expenses
us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Proceeds from Issuance or Sale of Equity, Total
Proceeds from Inducement Transaction, net of discounts and commissions
Net proceeds from exercise of common stock warrants
Proceeds from Warrant Exercises
GPC Member
Information regarding the GPC License Agreement.
Retained Earnings [Member]
Undesignated Preferred Stock [Member]
Preferred stock that has been classified as undesignated.
us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from Issuance of Common Stock
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.
Underwritten Public Offering [Member]
Represents information related to the underwritten public offering.
Royalty and direct contract acquisition costs
Represents the amount of royalty and direct contract acquisition costs.
Additional Paid-in Capital [Member]
Common Stock [Member]
Preferred Stock [Member]
KVK Warrant Liability [Member]
Represents information related to KVK warrant liability.
Equity Components [Axis]
Equity Component [Domain]
us-gaap_LongTermDebt
Long-term Debt, Total
Accounts Payable and Accrued Liabilities [Member]
Other Noncurrent Assets [Member]
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)
Class of Warrant or Right [Axis]
Other Current Liabilities [Member]
Class of Warrant or Right [Domain]
Other Noncurrent Liabilities [Member]
us-gaap_ConvertibleNotesPayable
Convertible Notes Payable, Total
Income (loss) before income taxes
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)
us-gaap_PaymentsOfDebtIssuanceCosts
Payment of debt issuance costs
us-gaap_DeferredRevenue
Deferred Revenue, Total
us-gaap_RepaymentsOfLongTermDebt
Repayments of Long-term Debt, Total
us-gaap_RepaymentsOfConvertibleDebt
Repayment of principal on convertible notes
Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Document Quarterly Report
Receivable [Policy Text Block]
Entity Incorporation, State or Country Code
us-gaap_DebtInstrumentCarryingAmount
Long-term Debt, Gross
General and Administrative Expense [Member]
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]
Document Transition Report
Entity Interactive Data Current
Security Exchange Name
Title of 12(b) Security
Proceeds from Payment Protection Program loan
Proceeds from Issuance of Long-term Debt, Total
Research and Development Expense [Member]
Income Statement Location [Axis]
Income Statement Location [Domain]
Nonmonetary Transaction Type [Domain]
Nonmonetary Transaction Type [Axis]
Antidilutive securities (in shares)
Diluted (in shares)
Weighted average number of shares of common stock outstanding, diluted (in shares)
kmph_RegulatoryMilestoneRevenueToBeEarnedFollowingFdaAcceptance
Regulatory Milestone Revenue to Be Earned Following FDA Acceptance
Represents the amount of revenue to which the entity will be entitled upon acceptance by the FDA.
kmph_LiabilitiesFairValueDisclosureIncreaseFromTenPercentIncreaseInEnterpriseValue
Liabilities, Fair Value Disclosure, Increase from Ten Percent Increase in Enterprise Value
The amount of increase in fair value of liability from a ten percent increase in the enterprise value.
Proceeds from equity line of credit
kmph_LiabilitiesFairValueDisclosureEstimatedAmountOfWeightedaverageProbabilityOfLiquidityEvent
Liabilities, Fair Value Disclosure, Estimated Amount of Weighted-average Probability of Liquidity Event
The estimated amount of liabilites fair value from weighted-average probability of liquidity event.
kmph_LiabilitiesFairValueDisclosureEstimatedAmountOfWeightedaverageProbabilityOfFundamentalChange
Liabilities, Fair Value Disclosure, Estimated Amount of Weighted-average Probability of Fundamental Change
The estimated amount of liability fair value due to weighted-average probability of fundamental change.
us-gaap_ProceedsFromSecuredNotesPayable
Proceeds from Secured Notes Payable
The December 2019 and January 2020 Notes [Member]
Represents the December 2019 and January 2020 notes.
Statement [Table]
kmph_PercentageOfConsultingServicesAndOutOfPocketThirdPartyResearchAndDevelopmentCostsRecognized
Percentage of Consulting Services and Out-of-pocket Third-party Research and Development Costs Recognized
Represents the percentage of consulting services and out-of-pocket third-party research and development costs that have been recognized as of the specified date.
December 2020 Exchange Agreement [Member]
Represents the December 2020 exchange agrement.
Statement of Financial Position [Abstract]
The Facility Notes [Member]
Represents the facility notes.
Diluted net (loss) income attributable to common stockholders per share of common stock (in dollars per share)
us-gaap_EarningsPerShareDiluted
Net (loss) income attributable to common stockholders (in dollars per share)
Weighted average number of shares of common stock outstanding, basic (in shares)
Basic (in shares)
Common stock issued as a result of warrant exercises (in shares)
Stock Issued During Period, Shares, Warrant Exercises (in shares)
The number of shares issued during the period from exercises of warrants.
Diluted net income (loss) per share of common stock:
Weighted Average Probability of Liquidity Event [Member]
Represents the weighted average probability of liquidity event.
Weighted Average Probability of Fundamental Change [Member]
Represents the weighted average probability of fundamental change.
Basic net (loss) income attributable to common stockholders per share of common stock (in dollars per share)
us-gaap_EarningsPerShareBasic
Net (loss) income attributable to common stockholders (in dollars per share)
Basic net income (loss) per share of common stock:
Statement of Cash Flows [Abstract]
Statement of Stockholders' Equity [Abstract]
Income Statement [Abstract]
Conversion of Series B-2 Preferred Stock into Common Stock [Member]
Represents the conversion of series B-2 preferred stock into common stock.
us-gaap_RepaymentsOfDebt
Repayments of Debt
The December 2020 Exchange Agreement [Member]
Represents the amended December 2020 exchange agreement.
Interest on lease liabilities
kmph_DebtInstrumentConvertibleOptionalConversionFeatureExchangePrice
Debt Instrument, Convertible, Optional Conversion Feature, Exchange Price (in dollars per share)
Represents the optional conversion feature exchange price.
kmph_DebtInstrumentConvertibleFloorPrice
Debt Instrument, Convertible, Floor Price (in dollars per share)
The floor price per share of the conversion feature embedded in the debt instrument.
Loss on sublease and disposal of property and equipment
Represents the loss on sublease and disposal of property and equipment recognized during the period.
us-gaap_FinanceLeaseLiabilityPaymentsDue
Total lease payments, finance leases
Amortization of right-of-use assets
us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount
Less: future interest expense, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
2022, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo
2023, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree
2024, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour
2025, finance leases
Type of Restructuring [Domain]
Interest and other (expense) income, net
Represents the amount of interest and other income (expense), net, recognized during the period.
Finance leases
Employee Severance [Member]
us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear
2021 (excluding the three months ended March 31, 2021), finance leases
kmph_ClassOfWarrantOrRightOfferingPricePerRelatedWarrant
Class of Warrant or Right, Offering Price, Per Related Warrant (in dollars per share)
Represents the offering price per related warrant.
Restructuring and Related Activities Disclosure [Text Block]
kmph_PurchaseAgreementOptionalPeriodToShares
Purchase Agreement Optional Period to Shares (Day)
Represents the period granted to the company by the underwriter as an option to purchase shares.
Restructuring Type [Axis]
Finance leases (years) (Year)
Pre-funded Warrants [Member]
Information pertaining to the pre-funded warrants.
Cash flows from financing activities:
Schedule of Common Stock Outstanding Roll Forward [Table Text Block]
Roth Capital Partners, LLC [Member]
Represents information pertaining to Roth Capital Partners, LLC.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Other long-term liabilities
kmph_PurchaseAgreementMaximumAdditionalSharesAvailableForPurchaseDuringTheOptionalPeriod
Purchase Agreement, Maximum, Additional Shares Available for Purchase During the Optional Period (in shares)
Represents the maximum additional shares available for purchase during the optional purchase period.
Consulting fees paid in common stock
The amount of consulting fees are paid in stock.
kmph_PurchaseAgreementMaximumSharesToBeIssued
Purchase Agreement, Maximum Shares to be Issued (in shares)
The maximum number of shares allowable to be issued under the current registration statement.
Conversion of December 2019 Notes into Common Stock [Member]
Represents the conversion of December 2019 Notes into common stock.
Existing Warrants [Member]
Information pertaining to the existing warrants.
KVK Warrant [Member]
Represents the KVK warrant.
Series A Preferred Stock [Member]
kmph_IncreaseDecreaseInOperatingLeaseRightofuseAsset
Operating lease right-of-use assets
The amount of increase (decrease) in operating lease right-of-use assets.
kmph_FinanceLeaseLiabilityToBePaidAfterYearFour
Thereafter, finance leases
Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
kmph_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour
Thereafter, operating leases
Amount of lessee's undiscounted obligation for lease payment for operating lease due after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
us-gaap_StockholdersEquity
Total stockholders' equity (deficit)
Balance
Balance
Equity Line of Credit [Member]
Related to the Equity Line of Credit.
Class of Stock [Axis]
Class of Stock [Domain]
Paycheck Protection Program CARES Act [Member]
Represents loan designed to provide funds for small businesses to keep their employees on the payroll.
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Embedded Deerfield Note Put Option [Member]
Represents the embedded Deerfield note put option.
Loans payable
Lincoln Park [Member]
Represents information pertaining to Lincoln Park Capital Fund, LLC.
kmph_PurchaseAgreementAdditionalSharesToBeIssuedAsCommitmentShares
Purchase Agreement, Additional Shares to Be Issued as Commitment Shares (in shares)
Represents the number of additional shares to be issued under a purchase agreement as commitment shares.
kmph_PurchaseAgreementTerm
Purchase Agreement, Term (Month)
Represents the term of a purchase agreement.
Convertible notes, less current portion, net