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PRINCIPAL BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Grant Income and the related expenses (Details) - USD ($)	12 Months Ended
	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