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PRINCIPAL BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Grant Income and the related expenses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
PRINCIPAL BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Grant income | $ 3,610,759 | $ 5,264,426
Grant income-related expenses | $ (3,583,233) | $ (5,129,952)

X
- Definition Represents the amount income incurred by grants. + References No definition available. + Details
Name: | ctso_GrantIncome
Namespace Prefix: | ctso_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of expenses related to grant. + References No definition available. + Details
Name: | ctso_GrantIncomeRelatedExpenses
Namespace Prefix: | ctso_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration