Name:	ctso_AggregateRegisteredAmountForOfferings
Namespace Prefix:	ctso_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Number of warrants or rights exercised.

No definition available.

Name:	ctso_ClassOfWarrantOrRightExercised
Namespace Prefix:	ctso_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Represents the number of trading days before the warrant expiration date on the basis of which volume-weighted average price (VWAP) of common stock is calculated.

No definition available.

Name:	ctso_ClassOfWarrantOrRightNumberOfTradingDaysBeforeWarrantExpirationDate
Namespace Prefix:	ctso_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Percentage used to calculate the exercise price of the warrants based on the volume-weighted average price (VWAP) of the company's common stock.

No definition available.

Name:	ctso_ClassOfWarrantOrRightPercentageToCalculateExercisePriceOfWarrantsBasedOnVolumeWeightedAveragePrice
Namespace Prefix:	ctso_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Aggregate number of common stock units reserved for exercise of warrants.

No definition available.

Name:	ctso_CommonStockUnitsReservedForExerciseOfWarrants
Namespace Prefix:	ctso_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Common Stock Value Authorized For Shares Authorized.

No definition available.

Name:	ctso_CommonStockValueAuthorized
Namespace Prefix:	ctso_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The proceeds associated with the amount received from rights offering, net of fees.

No definition available.

Name:	ctso_NetProceedsFromIssuanceRightsOffering
Namespace Prefix:	ctso_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The proceeds associated with the amount received from holders exercising their stock warrants, net of fees.

No definition available.

Name:	ctso_NetProceedsFromWarrantsExercises
Namespace Prefix:	ctso_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Number of shares in a unit.

No definition available.

Name:	ctso_NumberOfSharesInUnit
Namespace Prefix:	ctso_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of units subscribed to pro rata adjustment.

No definition available.

Name:	ctso_NumberOfUnitsSubscribedToProRataAdjustment
Namespace Prefix:	ctso_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the number of warrants expired.

No definition available.

Name:	ctso_NumberOfWarrants
Namespace Prefix:	ctso_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The cash inflow associated with the amount received from rights offering.

No definition available.

Name:	ctso_ProceedsFromIssuanceRightsOffering
Namespace Prefix:	ctso_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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.

No definition available.

Name:	ctso_StockholdersEquityLineItems
Namespace Prefix:	ctso_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The minimum required price of the warrants as per the terms of the rights offering during the reporting period.

No definition available.

Name:	ctso_WarrantsMinimumRequiredPrice
Namespace Prefix:	ctso_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

The number of days used for the calculation of volume weighted average price of the common stock issued with warrants as per the terms of the rights offering during the reporting period.

No definition available.

Name:	ctso_WarrantsNumberOfDaysForDeterminationOfVolumeWeightedAveragePrice
Namespace Prefix:	ctso_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of trading days used for the price of common stock issued with warrants as per the terms of the rights offering during the reporting period.

No definition available.

Name:	ctso_WarrantsNumberOfTradingDays
Namespace Prefix:	ctso_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 25
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481284/470-20-25-2

Name:	us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: 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

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

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

No definition available.

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

Aggregate number of common shares reserved for future issuance.

Reference 1: 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(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount of cost to be recognized for option under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The cash inflow associated with the amount received from holders exercising their stock warrants.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

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

Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-8

Name:	us-gaap_RestrictedCashCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	dei_LegalEntityAxis=ctso_JefferiesLlcAndB.RileyFbrIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_StatementScenarioAxis=ctso_ScenarioOneNoLimitationRelatingToMarketCapitalizationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

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

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