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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
SUMMARY OF STOCK OPTIONS | A summary of stock option awards as of December 31, 2021 and changes during the two-year period ended December 31, 2021 is presented below: SUMMARY OF STOCK OPTIONS
Stock Options |  | Number Outstanding |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2020 |  |  | 288,808 |  |  | $ | 39.45 |  |  |  |  |  |  |  |  |
Options granted |  |  | 44,683 |  |  | $ | 51.15 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (9,390 | ) |  | $ | 39.60 |  |  |  |  |  |  |  |  |
Options canceled or expired |  |  | (15,788 | ) |  | $ | 32.07 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2020 |  |  | 308,313 |  |  | $ | 41.55 |  |  |  |  |  |  |  |  |
Options granted |  |  | 148,016 |  |  | $ | 32.09 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (500 | ) |  | $ | 9.45 |  |  |  |  |  |  |  |  |
Options canceled or expired |  |  | (14,404 | ) |  | $ | 38.23 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2021 |  |  | 441,425 |  |  | $ | 38.70 |  |  |  | 7.4 |  |  | $ | – |
Exercisable at December 31, 2021 |  |  | 292,332 |  |  | $ | 40.58 |  |  |  | 6.9 |  |  | $ | – |
SUMMARY OF NON-VESTED RESTRICTED STOCK AWARDS | A summary of the status of the Company’s non-vested restricted stock awards as of December 31, 2021 and changes during the two-year period ended December 31, 2021, is presented below: SUMMARY OF NON-VESTED RESTRICTED STOCK AWARDS
Restricted Stock |  | Number Outstanding |  |  | Weighted Average Grant Date Fair Value |
Non-vested stock awards outstanding at January 1, 2020 |  |  | 583 |  |  | $ | 23.85 |
Granted |  |  | 28,773 |  |  | $ | 17.37 |
Vested and issued |  |  | (28,940 | ) |  | $ | 17.46 |
Forfeited |  |  | (233 | ) |  | $ | 23.85 |
Non-vested stock awards outstanding at December 31, 2020 |  |  | 183 |  |  | $ | 14.70 |
Granted |  |  | 1,466 |  |  | $ | 13.48 |
Forfeited |  |  | (66 | ) |  | $ | 33.30 |
Non-vested stock awards outstanding at December 31, 2021 |  |  | 1,583 |  |  | $ | 14.25 |
SUMMARY OF STOCK OPTIONS OUTSTANDING | A summary of stock options outstanding at December 31, 2021 by price range is as follows: SUMMARY OF STOCK OPTIONS OUTSTANDING
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Weighted Average Exercise Price |  |  | Number |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Weighted Average Exercise Price |
Up to $30.00 |  |  | 39,316 |  |  |  | 8.4 |  |  | $ | 21.93 |  |  |  | 17,648 |  |  |  | 7.8 |  |  | $ | 25.20 |
$30.01 to $75.00 |  |  | 397,903 |  |  |  | 7.5 |  |  | $ | 37.59 |  |  |  | 270,478 |  |  |  | 6.9 |  |  | $ | 37.80 |
Above $75.00 |  |  | 4,206 |  |  |  | 4.2 |  |  | $ | 282.27 |  |  |  | 4,206 |  |  |  | 4.3 |  |  | $ | 284.10 |
|  |  | 441,425 |  |  |  |  |  |  |  |  |  |  |  | 292,332 |  |  |  |  |  |  |  |  |
SCHEDULE OF ASSUMPTIONS USED TO DETERMINE FAIR VALUE OF OPTIONS GRANTED | The fair values of stock options granted were estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes model was originally developed for use in estimating the fair value of traded options, which have different characteristics from Celsion’s stock options. The model is also sensitive to changes in assumptions, which can materially affect the fair value estimate. The Company used the following assumptions for determining the fair value of options granted under the Black-Scholes option pricing model: SCHEDULE OF ASSUMPTIONS USED TO DETERMINE FAIR VALUE OF OPTIONS GRANTED
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Risk-free interest rate |  |  | 1.54 % to 1.74 | % |  |  | 0.65% to 1.33 | %
Expected volatility |  |  | 106.8% to 113.2 | % |  |  | 100.4% to 109.1 | %
Expected life (in years) |  |  | 7.5 to 10.0 |  |  |  | 7.5 to 10.0 |
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | %

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