Stock-Based Compensation | 9. Stock-Based Compensation Under the 2003 Plan, as restated in June 2011, and amended in 2015, the Company is authorized to issue stock options covering up to 6,000,000 common shares. A summary of stock option activity for the nine months ended September 30, 2015 (unaudited) is presented below. Weighted Average Weighted Remaining Number of Average Contractual Shares Exercise Price Life (in Years) Options outstanding at December 31, 2014 3,251,627 $ 6.07 5.60 Granted 981,848 $ 12.41 Exercised (535,845 ) $ 4.85 Forfeited or expired (192,935 ) $ 6.94 Options outstanding at September 30, 2015 3,504,695 $ 7.99 Options exercisable at September 30, 2015 1,598,802 $ 5.42 4.05 The estimated aggregate intrinsic value of stock options exercisable at September 30, 2015 was approximately $1.4 million based on the closing market price of the Companys common stock on such date. As of September 30, 2015, there was $12.2 million of total unrecognized compensation cost related to outstanding stock options that will be recognized over a weighted average period of 3.40 years. The following table summarizes Restricted Stock Unit (RSU) activity for the nine months ended September 30, 2015 (unaudited): Number Weighted Outstanding as of December 31, 2014 $ Awarded 190,000 12.43 Vested Forfeited/canceled Outstanding as of September 30, 2015 190,000 $ 12.43 The weighted average remaining contractual life and expense recognition period of the outstanding RSUs as of September 30, 2014 was 3.88 years. On January 1, 2015, the Companys current Chairman, who at that time was the Chief Executive Officer exercised stock options expiring on that date on a cashless basis to purchase 59,063 shares of common stock at an exercise price of $4.75 per share. Based on the closing market price of the Companys common stock of $10.26 on December 31, 2014, the Chief Executive Officer tendered 27,344 shares of common stock that he owned to satisfy the aggregate exercise price and surrendered 12,055 shares of common stock to satisfy the related $123,684 of income and payroll tax withholding amounts related to the transaction. On June 2, 2015 and June 3, 2015 the Companys current Chairman, who at that time was the Chief Executive Officer exercised stock options on a cashless basis to purchase 150,000 shares of common stock at an exercise price of $4.75 per share. Related to these exercises, the Chief Executive Officer tendered 50,753 shares of common stock that he owned to satisfy the aggregate exercise price. During the nine months ended September 30, 2015, the Company granted stock options to purchase 981,848 shares of common stock to certain employees and contractors. The options are exercisable for a period of ten years from the date of grant at $9.01 to $13.90 per share, which was the fair value of the Companys common stock on such dates. The options vest over a period of either four or five years. The fair value of these options, as calculated pursuant to the Black-Scholes option-pricing model, was determined to be $6,126,285 ($6.24 average per share). On a weighted average basis, assumptions used in the model were an expected term of 6.38 years, volatility of 49.3%, a risk-free interest rate of 2.16% and an expected dividend rate of 0%. On May 15, 2015 shareholders approved (1) an increase of 2,000,000 shares in the number of shares available for option awards under the 2011 Equity Incentive Plan, and (2) an Employee Stock Purchase Plan, with an initial 250,000 shares with annual increases of shares available equal to the lesser of (i) 1% of outstanding shares or (ii) 100,000 shares. The Company adopted an employee stock purchase plan in June, 2015 for all eligible employees. Under the plan, shares of the Companys common stock may be purchased at six-month intervals at 85% of the lower of the closing fair market value of the common stock (i) on the first trading day of the offering period or (ii) on the last trading day of the purchase period. An employee may purchase in any one calendar year shares of common stock having an aggregate fair market value of up to $25,000 determined as of the first trading day of the offering period. Additionally, a participating employee may not purchase more than 100,000 shares of common stock in any one offering period. At September 30, 2015, 250,000 shares were reserved for future issuance. The total stock-based compensation recognized for stock-based awards in the condensed consolidated statements of operations for the three and nine months ended September 30, 2015 and 2014 (unaudited) is as follows: Three Months Ended September 30, 2015 Three Months Ended September 30, 2014 Nine Months Ended September 30, 2015 Nine Months Ended September 30, 2014 Cost of sales $ 103,303 $ 70,131 $ 264,925 $ 132,467 Research and development 98,810 43,833 216,772 181,467 Clinical and regulatory 84,217 37,988 205,391 71,753 Selling and marketing 126,640 46,755 312,159 88,313 General and administrative 443,314 93,510 918,365 641,981 Total $ 856,284 $ 292,217 $ 1,917,612 $ 1,115,981 |