XML 33 R22.htm IDEA: XBRL DOCUMENT
v3.25.1

COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
COMMON STOCK, STOCK-BASED COMPENSATION AND WARRANTS |
Schedule of stock were valued on the date of issuance using the Monte Carlo pricing model with the following assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Series A Right Warrant |  | Series B Right Warrant | ​
Common Stock Price as of Issuance Date | ​ | $ | 0.94 | ​ | $ | 0.94 | ​
Risk-Free Rate | ​ | ​ | 4.31 | % |  | 4.27 | %
Dividend Rate | ​ | ​ | 0.00 | % |  | 0.00 | %
Volatility | ​ | ​ | 88.90 | % |  | 97.19 | %
Minimum Exercise Price | ​ | $ | 1.00 | ​ | $ | 2.00 | ​
Maximum Exercise Price | ​ | $ | 2.00 | ​ | $ | 4.00 | ​
Formula for Exercise Price | ​ | ​ | 90% of the 5-day volume weighted average stock price as of the exercise date rounded down to the nearest cent, not to fall outside the range of the maximum and minimum exercise prices. | ​
Schedule of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended March 31,
Stock-based compensation expense by category | ​ | 2025 |  | 2024
Stock-options | ​ | $ | 679,148 | ​ | $ | 734,210
Restricted stock-units (“RSUs”) | ​ |  | 139,278 | ​ |  | 225,255
Total stock-based compensation expense | ​ | $ | 818,426 | ​ | $ | 959,465
​
Schedule of stock options activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | Exercise Price | ​ | Contractual
​ |  | Shares |  | per Share |  | Life (Years)
Outstanding, December 31, 2024 |  | 12,341,914 | ​ | $ | 3.55 | ​ | 6.81
Granted |  | 39,500 | ​ | ​ | 1.03 |  | —
Forfeited |  | (46,876) | ​ | ​ | 2.05 |  | —
Expired |  | (34,781) | ​ | ​ | 5.27 |  | —
Outstanding, March 31, 2025 |  | 12,299,757 | ​ | $ | 3.54 |  | 6.74
Schedule of fair value of each stock option estimated using the Black-Scholes pricing model | The Company estimated the fair value of stock options granted during the three months ended March 31, 2025 using a Black-Scholes pricing model, which used the following inputs: ​
​ | ​ | ​ | ​ | ​
Exercise price (per share) | ​ | $ | 1.01 - $1.30 | ​
Expected volatility | ​ |  | 80.7 | %
Expected term* | ​ |  | 6 years | ​
Risk free rate | ​ |  | 4.01% - 4.40 | %
Dividends | ​ |  | 0 | %
Schedule of intrinsic value | The intrinsic value is calculated as the difference between the market value of the shares as of March 31, 2025, of $1.00 and the exercise price of the shares. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options Outstanding
​ | ​ | Number | ​ | Weighted | ​ | Weighted | ​ | ​ | ​
Range of | ​ | Outstanding at | ​ | Average | ​ | Average | ​ | Aggregate
Exercise | ​ | March 31, | ​ | Exercise | ​ | Remaining | ​ | Intrinsic
Price |  | 2025 |  | Price |  | Life (Years) |  | Value
$0.84 - $13.20 |  | 12,299,757 | ​ | $ | 3.54 | ​ | 6.74 | ​ | $ | 138,015
​
​ | ​ | ​ | ​ | ​ | ​ | ​
Options Exercisable
Number | ​ | Weighted | ​ |
Exercisable at | ​ | Average | ​ | Aggregate
March 31, | ​ | Exercise | ​ | Intrinsic
2025 |  | Price |  | Value
6,949,591 | ​ | $ | 4.98 | ​ | $ | 32,038
Schedule of company's non-vested options | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value
​ | ​ | ​ | ​ | ​ | ​
Non-vested, December 31, 2024 |  | 6,234,550 | ​ | $ | 1.09
Granted |  | 39,500 | ​ | $ | 0.75
Forfeited |  | (46,876) | ​ | $ | 1.34
Vested |  | (877,008) | ​ | $ | 1.02
Non-vested, March 31, 2025 |  | 5,350,166 | ​ | $ | 1.10
Schedule of outstanding balance of restricted stock units | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Total | ​ | Intrinsic Value
Outstanding, December 31, 2024 |  | 2,809,500 |  | $ | 2,556,645
Granted |  | 43,500 |  | ​ | —
Vested | ​ | (35,000) | ​ | ​ | —
Forfeited |  | (30,500) |  | ​ | —
Outstanding, March 31, 2025 |  | 2,787,500 | ​ | $ | 2,787,500
Schedule of the restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ |  | Shares |  | Fair Value
Non-vested, January 1, 2025 |  | 641,336 | ​ | $ | 1.31
Granted | ​ | 35,000 | ​ | ​ | 1.03
Vested |  | (65,000) | ​ | ​ | 0.96
Non-vested, March 31, 2025 |  | 611,336 | ​ | $ | 1.33

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

X
- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration