12. STOCK BASED COMPENSATION | Our stock-based compensation arrangements include grants of stock options and restricted stock awards under its equity incentive plans (collectively, the “Plans”), and certain awards granted outside of these plans. The compensation cost that has been charged against income related to stock options for the three and nine months ended September 30, 2018 was $844,181 and $2,439,887, respectively, and for the three and nine months ended September 30, 2017 was $1,067,778 and $3,702,748, respectively. The compensation cost that has been charged against income related to restricted stock awards for the three and nine months ended September 30, 2018 was $426,287 and $1,308,195, respectively, and for the three and nine months ended September 30, 2017 was $270,931 and $538,074, respectively. As of September 30, 2018, there was $4,418,388 all unrecognized compensation cost related to an aggregate of 498,239 of non-vested stock option awards and $3,456,690 related to an aggregate of 265,918 of non-vested restricted stock awards. These costs are expected to be recognized over a weighted-average period of 1.86 years for the stock options awards and 1.49 years for the restricted stock awards. During the three months ended September 30, 2018, the Company issued options to purchase an aggregate of 16,000 shares of the Company’s common stock under the Plans. The grant date fair value of these options was $208,940 using Black-Scholes option valuation models with the following assumptions: exercise price equal to the grant date stock price or average selling prices over the 30-business day period preceding the date of grant ranging from $20.6 to $23.55, volatility ranging from 65.15% to 66.34%, expected life of 6.0 years, and risk-free rate ranging from 2.86% to 3.00%. The Company is expensing these options on a straight-line basis over the requisite service period. During the nine months ended September 30, 2018, the Company issued options to purchase an aggregate of 206,682 shares of the Company’s common stock to officers, directors and employees under the Plans. The grant date fair value of these options was $2,809,655 using Black-Scholes option valuation models with the following assumptions: exercise price equal to the grant date stock price or average selling prices over the 30-business day period preceding the date of grant ranging from $14.5 to $23.55, volatility ranging from 65.15% to 90.43%, expected life of 6.0 years, and risk-free rate ranging from 2.33% to 3.00%. The Company is expensing these options on a straight-line basis over the requisite service period. During the three months ended September 30, 2017, the Company issued options to purchase an aggregate of 12,000 shares of the Company’s common stock to officers, directors, employees and advisors under the Plans. The grant date fair value of these options was $76,655 using Black-Scholes option valuation models with the following assumptions: exercise price equal to the grant date stock price ranging from $8.55 to $8.75, volatility ranging from 87.77% to 88.68%, expected life 6.0 years, and risk-free rate ranging from 1.94% to 2.07%. The Company is expensing these options on a straight-line basis over the requisite service period. During the nine months ended September 30, 2017, the Company issued options to purchase an aggregate of 523,738 shares of the Company’s common stock to officers, directors, employees and advisors under the Plans. The grant date fair value of these options was $4,425,913 using Black-Scholes option valuation models with the following assumptions: exercise price equal to the grant date stock price ranging from $5.3 to $13.2, volatility ranging from 87.77% to 89.62%, expected life 6.0 years, and risk-free rate ranging from 1.86% to 2.29%. The Company is expensing these options on a straight-line basis over the requisite service period. The following table summarizes stock option activity as of September 30, 2018 and December 31, 2017 and for the nine months ended September 30, 2018: Number of Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding as of December 31, 2017 1,892,189 $ 11.54 7.0 $ 4,909,194 Grants 206,682 Forfeitures (57,324 ) Exercises (233,484 ) Outstanding as of September 30, 2018 1,808,063 $ 12.32 6.7 $ 12,194,007 Vested and exercisable as of September 30, 2018 1,309,824 $ 11.29 5.9 $ 9,412,456 Exercise Number of Options Price Outstanding Exercisable $ 3.00 - $4.95 185,547 185,547 $ 5.00 - $9.19 465,124 428,176 $ 9.20 - $15.00 525,070 303,467 $ 15.01 - $20.00 468,822 261,534 $ 20.10 + 163,500 131,100 1,808,063 1,309,824 The aggregate intrinsic value for stock options outstanding is defined as the positive difference between the fair market value of our common stock and the exercise price of the stock options. Cash received from option exercises under all share-based compensation arrangements for the three and nine months ended September 30, 2018 was $1,542,840 and $2,708,603, respectively, as compared to $159,131 and $232,910 for the three and nine months ended September 30, 2017, respectively. The proceeds were from non-executives. |