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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2019
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Note 12. Stock-Based Compensation The Company has long-term compensation plans that permit the granting of equity based-awards in the form of stock options, restricted stock, restricted stock units, stock appreciation rights, other stock awards, and performance awards. At the 2018 Annual Stockholders Meeting of the Company held on May 15, 2018, stockholders approved the Celsion Corporation 2018 Stock Incentive Plan (the “2018 Plan”). The 2018 Plan, as adopted, permits the granting of 2,700,000 shares of Celsion common stock as equity awards in the form of incentive stock options, nonqualified stock options, restricted stock, restricted stock units, stock appreciation rights, other stock awards, performance awards, or in any combination of the foregoing. At the 2019 Annual Stockholders Meeting of the Company held on May 14, 2019, stockholders approved an amendment to the 2018 Plan whereby the Company increased the number of common stock shares available by 1,200,000 to a total of 3,900,000 under the 2018 Plan, as amended. Prior to the adoption of the 2018 Plan, the Company had maintained the Celsion Corporation 2007 Stock Incentive Plan (the “2007 Plan”). The 2007 Plan permitted the granting of 688,531 shares of Celsion common stock as equity awards in the form of incentive stock options, nonqualified stock options, restricted stock, restricted stock units, stock appreciation rights, phantom stock, performance awards, or in any combination of the foregoing. The 2018 Plan replaced the 2007 Plan although the 2007 Plan remains in effect for awards previously granted under the 2007 Plan. Under the terms of the 2018 Plan, any shares subject to an award under the 2007 Plan which are not delivered because of the expiration, forfeiture, termination or cash settlement of the award will become available for grant under the 2018 Plan. The Company has issued stock awards to employees and directors in the form of stock options and restricted stock. Options are generally granted with strike prices equal to the fair market value of a share of Celsion common stock on the date of grant. Incentive stock options may be granted to purchase shares of common stock at a price not less than 100% of the fair market value of the underlying shares on the date of grant, provided that the exercise price of any incentive stock option granted to an eligible employee owning more than 10% of the outstanding stock of Celsion must be at least 110% of such fair market value on the date of grant. Only officers and key employees may receive incentive stock options. Option and restricted stock awards vest upon terms determined by the Compensation Committee of the Board of Directors and are subject to accelerated vesting in the event of a change of control or certain terminations of employment. The Company issues new shares to satisfy its obligations from the exercise of options or the grant of restricted stock awards. On September 28, 2018, and again on February 19, 2019, the Compensation Committee of the Board of Directors approved the grant of (i) inducement stock options (the “Inducement Option Grants”) to purchase a total of 164,004 and 140,004 shares of Celsion common stock, respectively and (ii) inducement restricted stock awards (the “Inducement Stock Grants”) totaling 19,000 and 13,000 shares of Celsion common stock to five new employees collectively. Each award has a grant date of the date of grant. Each Inducement Option Grant has an exercise price per share equal to 2.77 and $2.18 which represents the closing price of Celsion’s common stock as reported by Nasdaq on September 28, 2018 and February 19, 2019, respectively. Each Inducement Option Grant will vest over three years, with one-third vesting on the one-year anniversary of the employee’s first day of employment with the Company and one-third vesting on the second and third anniversaries thereafter, subject to the new employee’s continued service relationship with the Company on each such date. Each Inducement Option Grant has a ten-year term and is subject to the terms and conditions of the applicable stock option agreement. Each of Inducement Stock Grant will vest on the one-year anniversary of the employee’s first day of employment with the Company and are subject to the new employee’s continued service relationship with the Company through such date and is subject to the terms and conditions of the applicable restricted stock agreement. As of June 30, 2019, there was a total of 4,582,893 shares of Celsion common stock reserved for issuance under the 2018 Plan which were comprised of 3,710,386 shares of Celsion common stock subject to equity awards previously granted under the 2018 Plan and 2007 Plan and 872,507 shares of Celsion common stock available for future issuance under the 2018 Plan. As of June 30, 2019, there was a total of 259,506 of Celsion common stock subject to outstanding inducement awards. Total compensation cost related to stock options and restricted stock awards amounted to $622,697 and $3,217,633 for the three-month periods ended June 30, 2019, and 2018, respectively. Of these amounts, $239,407 and $1,056,866 was charged to research and development during the three-month periods ended June 30, 2019 and 2018, respectively, and $383,290 and $2,160,767 was charged to general and administrative expenses during the three-month periods ended June 30, 2019 and 2018, respectively. Total compensation cost related to stock options and restricted stock awards amounted to $1,313,842 and $3,387,141 for the six-month periods ended June 30, 2019, and 2018, respectively. Of these amounts, $479,794 and $1,109,188 was charged to research and development during the six-month periods ended June 30, 2019 and 2018, respectively, and $834,048 and $2,277,953 was charged to general and administrative expenses during the six-month periods ended June 30, 2019 and 2018, respectively. As of June 30, 2019, there was $2.3 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements. That cost is expected to be recognized over a weighted-average period of 1.5 years. The weighted average grant date fair values of the stock options granted during the six-month periods ended June 30, 2019 and 2018 was $1.88 and $2.23, respectively. A summary of stock option awards and restricted stock grants for the six-months ended June 30, 2019 is presented below:
|  | 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, 2019 |  |  | 3,148,743 |  |  | $ | 2.67 |  |  |  | 22,500 |  |  | $ | 2.72 |  |  |  |  |
Equity awards granted |  |  | 805,004 |  |  | $ | 2.16 |  |  |  | 15,500 |  |  | $ | 2.17 |  |  |  |  |
Vested and issued |  |  | - |  |  | $ | - |  |  |  | (10,500 | ) |  | $ | 2.49 |  |  |  |  |
Equity awards forfeited, cancelled or expired |  |  | (11,355 | ) |  | $ | 2.37 |  |  |  | - |  |  | $ | - |  |  |  |  |
Equity awards outstanding at June 30, 2019 |  |  | 3,942,392 |  |  | $ | 2.56 |  |  |  | 27,500 |  |  | $ | 2.30 |  |  |  | 8.9 |
Aggregate intrinsic value of outstanding equity awards at June 30, 2019 |  | $ | - |  |  |  |  |  |  | $ | 27,500 |  |  |  |  |  |  |  |  |
Equity awards exercisable at June 30, 2019 |  |  | 2,420,261 |  |  | $ | 2.77 |  |  |  |  |  |  |  |  |  |  |  | 8.7 |
Aggregate intrinsic value of equity awards exercisable at June 30, 2019 |  | $ | 50,050 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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:
|  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |
Risk-free interest rate |  |  | 2.42% - 2.65 | % |  |  | 3.08 | %
Expected volatility |  |  | 101.3 -106.2 | % |  |  | 99.9 - 100.0 | %
Expected life (in years) |  |  | 7.5 - 9.3 |  |  |  | 9.5-10.0 |
Expected dividend yield |  |  | - | % |  |  | - | %
Expected volatilities utilized in the model are based on historical volatility of the Company’s stock price. The risk-free interest rate is derived from values assigned to U.S. Treasury bonds with terms that approximate the expected option lives in effect at the time of grant. Starting in 2017, the Company elected to account for any forfeitures when they occur.

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