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Note H - Fair Value of Financial Instruments (Details Textual)	9 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Deerfield Warrant Liability [Member]
Liabilities, Fair Value Disclosure, Total	$ 30,000	$ 288,000
Liabilities, Fair Value Disclosure, Increase from Ten Percent Increase in Enterprise Value	13,000
Liabilities, Fair Value Disclosure, Estimated Amount of Weighted-average Probability of Liquidity Event	40,000,000.0
Liabilities, Fair Value Disclosure, Estimated Amount of Weighted-average Probability of Fundamental Change	$ 555,000,000.0
Deerfield Warrant Liability [Member] | Weighted Average Probability of Liquidity Event [Member]
Derivative Liability, Measurement Input	0.25
Deerfield Warrant Liability [Member] | Weighted Average Probability of Fundamental Change [Member]
Derivative Liability, Measurement Input	29
Embedded Put Option [Member]
Liabilities, Fair Value Disclosure, Total	$ 4,000	$ 18,000
Liabilities, Fair Value Disclosure, Increase from Ten Percent Increase in Enterprise Value	$ 1,000

X

- Definition

The estimated amount of liability fair value due to weighted-average probability of fundamental change.

+ References

No definition available.

+ Details

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Namespace Prefix:	kmph_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The estimated amount of liabilites fair value from weighted-average probability of liquidity event.

+ References

No definition available.

+ Details

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Namespace Prefix:	kmph_
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X

- Definition

The amount of increase in fair value of liability from a ten percent increase in the enterprise value.

+ References

No definition available.

+ Details

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Namespace Prefix:	kmph_
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X

- Definition

Value of input used to measure derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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