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STOCK-BASED COMPENSATION - Warrants (Details) - $ / shares | Jun. 28, 2024 | Dec. 31, 2024 | Dec. 31, 2023
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STOCK-BASED COMPENSATION |  |  |
Number of shares to be purchased |  | 2,706,561 |
Warrant exercise price per share |  |  | $ 2
Stock price trigger for revision of exercise price of warrants | $ 0.79 |  |
Loan and security agreement |  |  |
STOCK-BASED COMPENSATION |  |  |
Warrant exercise price per share | $ 0.79 | $ 0.79 |
Class of warrant issued | 1,645,569 |  |

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

X
- Definition Price of the entity's common stock which would be required to be attained for revision of exercise price of warrants or rights. + References No definition available. + Details
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Namespace Prefix: | ctso_
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Balance Type: | na
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 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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |