Document And Entity Information
us-gaap_OtherReceivables
Other Receivables
Note To Financial Statement Details Textual
Significant Accounting Policies
Maturities of investments
Note A - Description of Business and Basis of Presentation
Note F - Common Stock and Warrants
Note G - Stock-based Compensation
Note H - Fair Value of Financial Instruments
Note I - Net Loss Per Share
Note J - Leases
Note A - Description of Business and Basis of Presentation - Consideration Paid and Purchase Price Allocation for the Acquisition of Arimoclomol (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)
Line of credit payable
kmph_EmployeeStockPurchasePlanMaximumNumberOfIssuableShares
Employee Stock Purchase Plan, Maximum Number of Issuable Shares (in shares)
Maximum number of shares that may be issued under Employee Stock Purchase Plan.
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)
us-gaap_LiabilitiesCurrent
Total current liabilities
Note I - Net Income (Loss) Per Share - Anti-dilutive Securities (Details)
Note I - Net Income (Loss) Per Share - Earnings Per Share (Details)
Note J - Leases - Lease Cost (Details)
Note J - Leases - Supplement Cash Flow Information Related to Leases (Details)
Other current liabilities
Note J - Leases - Supplement Balance Sheet Information Related to Lease (Details)
Note J - Leases - Maturities of lease Liabilities (Details)
Notes To Financial Statements
Notes To Financial Statements [Abstract]
kmph_EstimatedWeightedAverageCostOfCapital
Estimated Weighted Average Cost of Capital
Represents estimated weighted average cost of capital.
Arimoclomol Purchase Agreement [Member]
Represents Arimoclomol Purchase Agreement.
US Treasury Securities [Member]
Proceeds from Employee Stock Purchase Plan
Represents proceeds from employee stock purchase plan.
Assumed reserve liability
Asset Acquisition, Consideration Transferred, Estimated Reserve Liability
Represents estimated reserve liability for asset acquisition consideration transferred.
US Government Agencies Debt Securities [Member]
kmph_ContractWithCustomerClawbackLiability
Contract with Customer, Clawback Liability
Represents clawback liability for contract with customer
Corporate Debt Securities [Member]
kmph_AssetAcquisitionRecognizedIdentifiableAssetsAcquired
Total purchase price to be allocated
Total allocated purchase price
Amount of assets acquired at the acquisition date.
Property and equipment, inventory and assembled workforce acquired
Property and equipment, inventory and assembled workforce acquired.
IPR&D (2)
Asset Acquisition, Recognized Identifiable Assets, Finite-Lived Intangibles
Represents finite-lived intangible assets acquired.
us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Proceeds from Debt, Net of Issuance Costs
us-gaap_PaymentsToAcquireInvestments
Purchases of investments
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.
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.
JMP and RBCCM [Member]
Represents JMP Securities LLC ("JMP") and RBC Capital Markets, LLC ("RBCCM").
kmph_PlacementAgentFeePercentage
Placement Agent Fee, Percentage
The percentage amount of the placement agent fee.
January 2021 Inducement Warrants [Member]
Related to January 2021 inducement warrants.
kmph_EquityDistributionAgreementMaximumAggregateOfferingPrice
Equity Distribution Agreement, Maximum Aggregate Offering Price
The maximum aggregate offering price under the equity distribution agreement.
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_EquityDistributionAgreementCommissionFeePercentageOfGrossSales
Equity Distribution Agreement, Commission Fee, Percentage of Gross Sales
The percentage of gross sales for commission fee 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.
Proceeds from insurance financing arrangements
Represents proceeds from insurance financing arrangements.
Amounts due for property and equipment included in accounts payable and accrued expenses
Credit Facility [Axis]
Credit Facility [Domain]
kmph_PaymentsOfPrincipalOnInsuranceFinancingArrangements
Payments of principal on insurance financing arrangements
Represents payments of principal on insurance financing arrangements.
us-gaap_PolicyTextBlockAbstract
Accounting Policies
kmph_BeneficialOwnershipCapLimitPercentage
Beneficial Ownership, Cap Limit, Percentage
Represents the percentage of beneficial ownership less or equal to Cap.
Cash
Payments to Acquire Productive Assets, Total
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of property and equipment
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
us-gaap_LossContingencyAccrualAtCarryingValue
Loss Contingency Accrual, Ending Balance
Weighted average number of shares of common stock outstanding:
Operating lease liabilities
us-gaap_Assets
Total assets
Supplemental cash flow information:
Preferred Stock [Text Block]
Plan Name [Axis]
Plan Name [Domain]
In Process Research and Development [Member]
Net (loss) income attributable to shares of common stockholders, basic and diluted
Net loss attributable to common stockholders
us-gaap_SubleaseIncome
Less: sublease income
Finite-Lived Intangible Assets by Major Class [Axis]
us-gaap_IncomeTaxReceivable
Income Taxes Receivable
Share-Based Payment Arrangement [Text Block]
Finite-Lived Intangible Assets, Major Class Name [Domain]
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 Income (loss)
Net loss
Net (loss) income
Performance Shares [Member]
Share-Based Payment Arrangement [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.
Undistributed net loss attributable to common stockholders, basic and diluted
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.
us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Accounts payable and accrued expenses
us-gaap_IncomeTaxExpenseBenefit
Income tax benefit
Issuance of common stock in connection with the exercise of warrants in the Inducement Transaction, net of discounts and commissions
Value of stock issued during the period for exercises of warrants, net of discounts and commissions.
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.
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 common stock 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_CertificatesOfDepositAtCarryingValue
Certificates of Deposit, at Carrying Value
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.
us-gaap_TreasuryStockSharesAcquired
Common stock repurchased as a result of the Stock Repurchase Plan (in shares)
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)
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_DebtInstrumentBasisSpreadOnVariableRate1
Debt Instrument, Basis Spread on Variable Rate
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
Document Information [Line Items]
Document Information [Table]
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance as of beginning of period
Balance as of end of period
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.
Variable Rate [Domain]
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.
Fair value of warrants issued
Variable Rate [Axis]
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_TreasuryStockValue
Treasury Stock, Value, Total
Treasury stock, at cost
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.
Deerfield Warrant [Member]
Represents the Deerfield Warrant.
us-gaap_IncreaseDecreaseInInventories
Inventories
Trading Symbol
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
Common stock issued as a result of the Employee Stock Purchase Plan (in shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)
Local Phone Number
us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Line of Credit Facility, Remaining Borrowing Capacity
us-gaap_TableTextBlock
Notes Tables
Issuance of common stock as part of the Employee Stock Purchase Plan
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.
us-gaap_StockIssuedDuringPeriodSharesNewIssues
Stock Issued During Period, Shares, New Issues (in shares)
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Issuance of common stock in exchange for consulting services
Common stock issued as compensation to third-parties (in shares)
Common stock issued as compensation to third-parties (in shares)
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' equity
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.
Acquired in-process research and development
Accumulated deficit
Research and development
Debt Disclosure [Text Block]
us-gaap_InterestExpense
Interest expense on principal
Change in assets and liabilities:
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.
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
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
Current portion of operating lease liabilities
us-gaap_FinanceLeaseLiabilityCurrent
Other current liabilities
us-gaap_FinanceLeaseLiabilityNoncurrent
Other long-term liabilities
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
2025, operating leases
Measurement Input Type [Domain]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
2026, operating leases
us-gaap_FinanceLeaseRightOfUseAsset
Property and equipment, net
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2023, operating leases
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2024, 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.
Other long-term assets
us-gaap_ShareBasedCompensation
Stock-based compensation expense
us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Debt Conversion, Converted Instrument, Shares Issued (in shares)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
2022 (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
Facility Notes principal converted to Series B-2 Preferred Stock
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.
Total assets
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.
Long-term investments
us-gaap_ConversionOfStockSharesIssued1
Conversion of Stock, Shares Issued (in shares)
Financial liabilities measured at fair value on recurring basis
Liabilities, Fair Value Disclosure, Total
Depreciation and amortization expense
us-gaap_SharesIssuedPricePerShare
Shares Issued, Price Per Share (in dollars per share)
Stock Conversion Description [Axis]
Inventories
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.
us-gaap_TreasuryStockShares
Treasury Stock, Shares, Total (in shares)
Share Repurchase Program [Member]
Common stock, $0.0001 par value, 250,000,000 shares authorized, 35,399,267 shares issued and 34,489,314 shares outstanding as of June 30, 2022; 35,325,801 shares issued and 35,005,640 shares outstanding as of December 31, 2021
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 (in shares)
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]
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, 2022 or December 31, 2021
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, net
Revenue from Contract with Customer, Including Assessed Tax
Fair Value, Inputs, Level 3 [Member]
Fair Value Hierarchy and NAV [Domain]
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
Short-term investments
Additional paid-in capital
Stockholders’ equity:
us-gaap_NonoperatingIncomeExpense
Total other income (expense)
Other income (expense):
Fair Value Disclosures [Text Block]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash and cash equivalents, beginning of period
Cash and cash equivalents, 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 (decrease) increase in cash and cash equivalents
Over-Allotment Option [Member]
us-gaap_Liabilities
Total liabilities
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by financing activities
Commitments and contingencies (Note D)
Sale of Stock [Axis]
Sale of Stock [Domain]
us-gaap_OperatingIncomeLoss
(Loss) income from operations
us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Contract with Customer, Liability, Revenue Recognized
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash (used in) provided by operating activities
Prepaid expenses and other current assets
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash used in investing activities
Cost of revenue
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
us-gaap_PaymentsForRepurchaseOfCommonStock
Payment to repurchase shares as part of the Share Repurchase Program
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.
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Underwritten Public Offering [Member]
Represents information related to the underwritten public offering.
Share Repurchase Program [Domain]
Common Stock [Member]
us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock Repurchase Program, Authorized Amount
Preferred Stock [Member]
KVK Warrant Liability [Member]
Represents information related to KVK warrant liability.
Equity Components [Axis]
Share Repurchase Program [Axis]
Equity Component [Domain]
us-gaap_LongTermDebt
Long-term Debt, Total
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
(Loss) income before income taxes
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)
us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
Line of Credit Facility, Maximum Amount Outstanding During Period
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
us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from Issuance of Long-term Debt, Total
Research and Development Expense [Member]
Income Statement Location [Axis]
Income Statement Location [Domain]
Antidilutive securities (in shares)
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.
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.
Asset Class [Axis]
us-gaap_ProceedsFromSecuredNotesPayable
Proceeds from Secured Notes Payable
The December 2019 and January 2020 Notes [Member]
Represents the December 2019 and January 2020 notes.
Asset Class [Domain]
Statement [Table]
December 2020 Exchange Agreement [Member]
Represents the December 2020 exchange agrement.
The Facility Notes [Member]
Represents the facility notes.
Statement of Financial Position [Abstract]
Basic and diluted (in shares)
kmph_StockIssuedDuringPeriodSharesWarrantExercises
Stock Issued During Period, Shares, Warrant Exercises (in shares)
The number of shares issued during the period from exercises of warrants.
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 and diluted net loss attributable to common stockholders per share of common stock (in dollars per share)
Net loss attributable to common stockholders (in dollars per share)
Basic and diluted net 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.
Proceeds from issuance of debt
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
2023, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo
2024, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree
2025, finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour
2026, finance leases
Asset Acquisition [Axis]
Total consideration
Total consideration
Interest and other income (expense), net
Represents the amount of interest and other income (expense), net, recognized during the period.
Finance leases
us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear
2022 (excluding the three months ended June 30, 2022), 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.
Direct transaction costs associated with the acquisition (1)
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.
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
Asset Acquisition [Domain]
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.
Conversion of December 2019 Notes into Common Stock [Member]
Represents the conversion of December 2019 Notes into common stock.
Asset Acquisition [Table Text Block]
Existing Warrants [Member]
Information pertaining to the existing warrants.
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.
Current portion of discount and rebate liabilities
Current portion of discount and rebate liabilities.
Discount and rebate liabilities, less current portion
Noncurrent portion of discount and rebate liabilities.
us-gaap_StockholdersEquity
Total stockholders' equity
Balance
Balance
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Acquisitions, net
Fair value adjustment related to investments
Fair value adjustment related to investments.
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.
kmph_TreasuryStockValueAcquired
Shares repurchased as part of the Share Repurchase Program
Amount of treasury stock acquired.
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Discount and rebate liabilities
Increase (decrease) in discount and rebate liabilities.
us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount