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LEASES (Tables)

9 Months Ended

Sep. 30, 2025

LEASES

Schedule of statement of operations and cash flows related to operating lease liability

​

​	​	​	​	​	​	​
​		September 30,
​		2025			2024
​	​	(amounts, in thousands)
Cash paid in connection with the operating leases	​	$	1,264	​	$	1,235

Schedule of supplemental balance sheet information related to operating leases

​

​	​	​	​	​	​	​	​
​	​	September 30,		​	December 31,		​
​		2025			2024		​
​	​	(amounts, in thousands)					​
Right-of-use asset	​	$	11,075	​	$	11,511	​
Lease liability - current portion	​	$	518	​	$	453	​
Lease liability - net of current portion	​	​	12,051	​	​	12,444	​
Total lease liability	​	$	12,569	​	$	12,897	​
Weighted average discount rate	​		9.8	%	​	9.8	%
Weighted average remaining lease term	​	​	11.4 years	​	​	11.7 years	​

Schedule of components of lease expense

​

​	​	​	​	​	​	​
​		Three Months Ended September 30,
​	​	2025			2024
​	​	(amounts, in thousands)
Operating lease cost	​	$	440	​	$	409
Variable lease cost	​	​	207	​	​	156
Total lease cost	​	$	647	​	$	565

​

​	​	​	​	​	​	​
​		Nine Months Ended September 30,
​	​	2025			2024
​	​	(amounts, in thousands)
Operating lease cost	​	$	1,288	​	$	1,297
Variable lease cost	​	​	356	​	​	360
Total lease cost	​	$	1,644	​	$	1,657

Schedule of maturities of the operating lease liability

As of September 30, 2025, the maturities of the operating lease liability are as follows:

​	​	​	​
Remainder of 2025		$	431
2026	​		1,736
2027	​		1,777
2028	​		1,819
2029	​		1,863
Thereafter	​		13,550
Future operating lease payments	​	​	21,176
Imputed interest	​	​	(8,607)
Total operating lease liability	​	$	12,569

​

X

- Definition

Tabular disclosure of Lessee's right-of-use-assets and lease liability under operating lease.

+ References

No definition available.

+ Details

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X

- Definition

The tabular disclosure on supplemental statement of operations and cash flows relating to operating leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctso_
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X

- Definition

Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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- References

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- Definition

Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-6

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