Represents the number of former employees.

No definition available.

Name:	sava_NumberOfFormerEmployees
Namespace Prefix:	sava_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Subparagraph (k)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479105/946-220-45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(6))
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_LegalFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LitigationReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

+ Details

Name:	us-gaap_LossContingencyAccrualProvision
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

+ Details

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_LitigationCaseAxis=sava_ViolationsOfFederalSecuritiesLawsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsTexasCourtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsTexasStateCourtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsDelawareCourtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=sava_ShareholderDerivativeActionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_LitigationCaseAxis=sava_AntislappLawsuitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 10 - Contingencies (Details Textual) $ in Thousands						1 Months Ended	2 Months Ended	3 Months Ended	9 Months Ended	20 Months Ended
Note 10 - Contingencies (Details Textual) $ in Thousands	Sep. 06, 2024	Aug. 06, 2024	Mar. 18, 2024	Jul. 05, 2022	Jun. 30, 2022	Feb. 28, 2025 USD ($)	Oct. 26, 2021	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Jun. 20, 2023	Jun. 20, 2023	Oct. 01, 2025 USD ($)	May 31, 2025 USD ($)
Estimated Litigation Liability								$ 35,250	$ 35,250
Loss Contingency Accrual, Provision								0	35,250
Violations of Federal Securities Laws [Member]
Loss Contingency, New Claims Filed, Number					1		4
Estimated Litigation Liability								$ 31,250	$ 31,250				$ 31,250
Shareholder Derivative Actions, Texas Court [Member]
Loss Contingency, New Claims Filed, Number										4	2
Shareholder Derivative Actions, Texas State Court Member
Loss Contingency, New Claims Filed, Number											1
Shareholder Derivative Actions, Delaware Court [Member]
Loss Contingency, New Claims Filed, Number											1
Shareholder Derivative Actions [Member]
Loss Contingency, New Claims Filed, Number	2		2	3
Legal Fees						$ 1,000
Anti-SLAPP Lawsuit [Member]
Number of Former Employees		2
Anti-SLAPP Lawsuit [Member] \| Subsequent Event [Member]
Estimated Litigation Liability												$ 2,500