XML 47 R33.htm IDEA: XBRL DOCUMENT
v3.25.3

COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS - Additional information (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 11, 2025 D $ / shares | Feb. 24, 2025 USD ($) $ / shares shares | Jan. 10, 2025 USD ($) D $ / shares shares | Dec. 30, 2021 USD ($) | Sep. 30, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) | Jul. 26, 2024 USD ($) | Dec. 13, 2023 $ / shares
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Aggregate gross proceeds |  |  | $ 6,250 |  |  |  |  |
Net of fees offering |  |  | $ 5,400 |  |  |  |  |
Reserved for rights offering | shares |  |  | 6,250,000 |  |  |  |  |
Number of shares | shares |  |  | 1 |  |  |  |  |
Restricted cash, current |  |  | $ 5,000 |  |  | $ 5,000 |  |
Common stock reserved for issuance | shares |  |  | 6,250,000 |  |  |  |  |
Total Units subscribed to pro rata adjustment | shares |  |  | 450,000 |  |  |  |  |
Percentage of right warrants |  |  | 90.00% |  |  |  |  |
Warrant exercise price per share | $ / shares |  | $ 1.13 |  |  |  |  |  | $ 2
Right warrants were exercised by holders | shares |  | 1,400,000 |  |  |  |  |  |
Additional aggregate gross proceeds |  | $ 1,600 |  |  | $ 1,439 |  |  |
Net of fees warrants |  | $ 1,400 |  |  |  |  |  |
Aggregate registered amount for offerings |  |  |  |  |  |  | $ 150,000 |
Grant date exercise price range | $ / shares |  |  |  |  | $ 0.93 |  |  |
Total unrecognized compensation cost related to stock options |  |  |  |  | $ 2,100 |  |  |
Amortized period |  |  |  |  | 18 months |  |  |
Compensation expense |  |  |  |  | $ 600 |  |  |
Restricted stock-units ("RSUs") |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 26 months |  |  |
Jefferies LLC and B. Riley FBR, Inc | Scenario one limitations related to our market capitalization |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Aggregate offering price |  |  |  | $ 75,000 |  |  |  |
Series A Right Warrants |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Number of common stock purchased by each warrant | shares |  |  | 1 |  |  |  |  |
Fair value of warrants and recorded within additional paid-in-capital |  |  | $ 300 |  |  |  |  |
Percentage of right warrants |  |  | 90.00% |  |  |  |  |
Number of trading days | D |  |  | 5 |  |  |  |  |
Number of warrants expired | shares |  | 4,850,000 |  |  |  |  |  |
Number of days used for the calculation of volume weighted average price of the common stock issued | D |  |  | 5 |  |  |  |  |
Series A Right Warrants | Maximum |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  | $ 2 |  |  |  |  |
Series A Right Warrants | Minimum |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  | $ 1 |  |  |  |  |
Series B Right Warrants |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Number of common stock purchased by each warrant | shares |  |  | 1 |  |  |  |  |
Fair value of warrants and recorded within additional paid-in-capital |  |  | $ 100 |  |  |  |  |
Percentage of right warrants |  |  | 90.00% |  |  |  |  |
Number of trading days | D |  |  | 5 |  |  |  |  |
Number of days used for the calculation of volume weighted average price of the common stock issued | D | 5 |  |  |  |  |  |  |
Number of trading days | D | 5 |  |  |  |  |  |  |
Minimum required price of the warrants | $ / shares | $ 2 |  |  |  |  |  |  |
Series B Right Warrants | Maximum |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  | $ 4 |  |  |  |  |
Series B Right Warrants | Minimum |  |  |  |  |  |  |  |
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |  |  |  |  |  |  |  |
Warrant exercise price per share | $ / shares |  |  | $ 2 |  |  |  |  |

X
- Definition Aggregate maximum amount of securities that can be offered and sold, in one or more offerings, in any combination of common stock, preferred stock, senior or subordinated debt securities, warrants and units, pursuant to shelf registration. + References No definition available. + Details
Name: | ctso_AggregateRegisteredAmountForOfferings
Namespace Prefix: | ctso_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of warrants or rights exercised. + References No definition available. + Details
Name: | ctso_ClassOfWarrantOrRightExercised
Namespace Prefix: | ctso_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | ctso_ClassOfWarrantOrRightNumberOfTradingDaysBeforeWarrantExpirationDate
Namespace Prefix: | ctso_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage used to calculate the exercise price of the warrants based on the volume-weighted average price (VWAP) of the company's common stock. + References No definition available. + Details
Name: | ctso_ClassOfWarrantOrRightPercentageToCalculateExercisePriceOfWarrantsBasedOnVolumeWeightedAveragePrice
Namespace Prefix: | ctso_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate number of common stock units reserved for exercise of warrants. + References No definition available. + Details
Name: | ctso_CommonStockUnitsReservedForExerciseOfWarrants
Namespace Prefix: | ctso_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common Stock Value Authorized For Shares Authorized. + References No definition available. + Details
Name: | ctso_CommonStockValueAuthorized
Namespace Prefix: | ctso_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The proceeds associated with the amount received from rights offering, net of fees. + References No definition available. + Details
Name: | ctso_NetProceedsFromIssuanceRightsOffering
Namespace Prefix: | ctso_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The proceeds associated with the amount received from holders exercising their stock warrants, net of fees. + References No definition available. + Details
Name: | ctso_NetProceedsFromWarrantsExercises
Namespace Prefix: | ctso_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of shares in a unit. + References No definition available. + Details
Name: | ctso_NumberOfSharesInUnit
Namespace Prefix: | ctso_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of units subscribed to pro rata adjustment. + References No definition available. + Details
Name: | ctso_NumberOfUnitsSubscribedToProRataAdjustment
Namespace Prefix: | ctso_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of warrants expired. + References No definition available. + Details
Name: | ctso_NumberOfWarrants
Namespace Prefix: | ctso_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow associated with the amount received from rights offering. + References No definition available. + Details
Name: | ctso_ProceedsFromIssuanceRightsOffering
Namespace Prefix: | ctso_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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: | ctso_StockholdersEquityLineItems
Namespace Prefix: | ctso_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum required price of the warrants as per the terms of the rights offering during the reporting period. + References No definition available. + Details
Name: | ctso_WarrantsMinimumRequiredPrice
Namespace Prefix: | ctso_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | ctso_WarrantsNumberOfDaysForDeterminationOfVolumeWeightedAveragePrice
Namespace Prefix: | ctso_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References No definition available. + Details
Name: | ctso_WarrantsNumberOfTradingDays
Namespace Prefix: | ctso_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition 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. + References 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 + Details
Name: | us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References 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 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate number of common shares reserved for future issuance. + References 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 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References 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 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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. + References 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 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References 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 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References 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 + Details
Name: | us-gaap_ProceedsFromWarrantExercises
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition 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. + References 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 + Details
Name: | us-gaap_RestrictedCashCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition 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. + References 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 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References 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 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | dei_LegalEntityAxis=ctso_JefferiesLlcAndB.RileyFbrIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=ctso_ScenarioOneNoLimitationRelatingToMarketCapitalizationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=ctso_SeriesBRightWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |