Class of warrant or right date from which warrants or rights expired end date.

No definition available.

Name:	kant_ClassOfWarrantOrRightDateFromWhichWarrantsOrRightsExpiredEndDate
Namespace Prefix:	kant_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Class of warrant or right date from which warrants or rights expired start date.

+ References

No definition available.

+ Details

Name:	kant_ClassOfWarrantOrRightDateFromWhichWarrantsOrRightsExpiredStartDate
Namespace Prefix:	kant_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrant or rights cancelled or expired.

+ References

No definition available.

+ Details

Name:	kant_WarrantOrRightsCancelledOrExpired
Namespace Prefix:	kant_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrant or rights exercised.

+ References

No definition available.

+ Details

Name:	kant_WarrantOrRightsExercised
Namespace Prefix:	kant_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrant or rights issued.

+ References

No definition available.

+ Details

Name:	kant_WarrantOrRightsIssued
Namespace Prefix:	kant_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=kant_TwoThousandSeventeenWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=kant_TwoThousandNineteenWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=kant_TwoThousandTwentyTwoWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=kant_TwoThousandTwentyThreeWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=kant_TwoThousandTwentyFiveWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity - Schedule of Issued and Outstanding Warrants to Purchase Shares of the Company's Common Stock (Details) - $ / shares shares in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Class Of Warrant Or Right [Line Items]
Number Outstanding, Beginning	2,718	3,504	3,504
Issued	655	0
Exercised	(50)	(780)
Cancelled/Expired	(2,425)	0
Number Outstanding, Ending	898	2,724	2,718	3,504
2017
Class Of Warrant Or Right [Line Items]
Expiration Date, Start			2025-06	2025-03
Expiration Date, End				2025-06
Number Outstanding, Beginning	126	126	126
Exercised	(32)
Cancelled/Expired	(84)
Number Outstanding, Ending	10	126	126	126
2017 \| Minimum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price	$ 0.14	$ 0.14
2017 \| Maximum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price	$ 21.8	$ 21.8
2019
Class Of Warrant Or Right [Line Items]
Expiration Date, Start				2025-03
Expiration Date, End				2027-04
Number Outstanding, Beginning	44	44	44
Exercised	(18)
Cancelled/Expired	(26)	0
Number Outstanding, Ending		44	44	44
2019 \| Minimum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price		$ 0.14
2019 \| Maximum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price		$ 21.8
2022
Class Of Warrant Or Right [Line Items]
Expiration Date, Start			2025-08	2025-08
Expiration Date, End			2029-12	2029-12
Number Outstanding, Beginning	117	123	123
Exercised	0	0
Number Outstanding, Ending	117	123	117	123
2022 \| Minimum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price	$ 0.14	$ 0.14
2022 \| Maximum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price	$ 168.35	$ 168.35
2023
Class Of Warrant Or Right [Line Items]
Expiration Date, Start			2025-12	2025-12
Expiration Date, End			2028-10	2029-04
Number Outstanding, Beginning	2,431	3,211	3,211
Exercised	0	(780)
Cancelled/Expired	(2,315)
Number Outstanding, Ending	116	2,431	2,431	3,211
2023 \| Minimum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price	$ 0.14	$ 3.25
2023 \| Maximum [Member]
Class Of Warrant Or Right [Line Items]
Range of Exercise Price	$ 5.26	$ 5.26
2025
Class Of Warrant Or Right [Line Items]
Expiration Date, Start			2025-04
Number Outstanding, Beginning	0
Issued	655
Number Outstanding, Ending	655		0
Range of Exercise Price	$ 0.001