XML 42 R33.htm IDEA: XBRL DOCUMENT
v3.22.1

Stock-Based Compensation (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of Stock Option Awards and Restricted Stock Grants | A summary of stock option awards and restricted stock grants for the three-months ended March 31, 2022 is presented below: Summary of Stock Option Awards and Restricted Stock Grants
|  | Stock Options |  |  | Restricted Stock Awards |  |  | Weighted Average |
|  | Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Non-vested Restricted Stock Outstanding |  |  | Weighted Average Grant Date Fair Value |  |  | Contractual Terms of Equity Awards (in years) |
Equity awards outstanding at January 1, 2022 |  |  | 441,425 |  |  | $ | 38.49 |  |  |  | 1,481 |  |  | $ | 12.36 |  |  |  |  |
Equity awards granted |  |  | 224,276 |  |  | $ | 4.60 |  |  |  | 400 |  |  | $ | 4.60 |  |  |  |  |
Equity awards outstanding at March 31, 2022 |  |  | 665,701 |  |  | $ | 27.07 |  |  |  | 1,881 |  |  | $ | 10.71 |  |  |  | 8.0 |
Aggregate intrinsic value of outstanding equity awards at March 31, 2022 |  | $ | 103,167 |  |  |  |  |  |  | $ | 20,145 |  |  |  |  |  |  |  |  |
Equity awards exercisable at March 31, 2022 |  |  | 419,559 |  |  | $ | 33.22 |  |  |  |  |  |  |  |  |  |  |  | 7.5 |
Aggregate intrinsic value of equity awards exercisable at March 31, 2022 |  | $ | 34,304 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Assumptions Used to Determine Fair Value of Options Granted | Schedule of Assumptions Used to Determine Fair Value of Options Granted
|  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 1.74 | % |  |  | 1.64 to 1.74 | %
Expected volatility |  |  | 108.5 | % |  |  | 106.8 to 112.5 | %
Expected life (in years) |  |  | 8.5 to 9.0 |  |  |  | 7.5 to 10.0 |
Expected dividend yield |  |  | - | % |  |  | - | %

X
- Definition Summary of Stock Option and Restricted Stock Awards [Table Text Block] + References No definition available. + Details
Name: | CLSN_SummaryOfStockOptionAndRestrictedStockAwardsTableTextBlock
Namespace Prefix: | CLSN_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration