Stock Incentive Plans | 8. Stock Incentive Plans In 2008, our board of directors adopted the 2008 Stock Incentive Plan (the “2008 Plan”), which provided for the grant of incentive stock options, nonqualified stock options, and restricted stock to employees, directors, and nonemployees of the Company up to 3,547,741 shares of common stock. Option awards expire 10 years from the grant date and generally vest over four years, but vesting conditions can vary at the discretion of our board of directors. In July 2015, the Company approved the 2015 Stock Option and Incentive Plan (the “2015 Plan”), which became effective upon our initial public offering (“IPO”). The 2015 Plan allows the grant of incentive stock options, nonqualified stock options, and restricted stock to employees, directors, and nonemployees of the Company up to 3,566,296 shares of common stock. In connection with the adoption of the 2015 Plan, no further option grants are permitted under the 2008 Plan and any expirations, cancellations, or terminations under the previous plan are available for issuance under the 2015 Plan. On January 1, 2016, the number of shares reserved and available for issuance under the 2015 Stock Plan increased by 960,504 shares of common stock pursuant to a provision in the 2015 Stock Plan that provides that the number of shares reserved and available for issuance will automatically increase each January 1, beginning on January 1, 2016, by 4% of the number of shares of common stock issued and outstanding on the immediately preceding December 31 or such lesser number as determined by the compensation committee of the board of directors. In October 2016, the compensation committee of the board of directors determined there would be no increase to the shares reserved and available under the 2015 Stock Plan on January 1, 2017. As of September 30, 2017, the total number of shares authorized for stock award plans is 7,114,037 of which 3,172,219 remain available for grant. There are 3,632,340 stock options outstanding as of September 30, 2017. Stock-based compensation for the three and nine months ended September 30, 2017 and 2016 consisted of the following: Three Months Nine Months Ended 2017 2016 2017 2016 ($ in thousands) General and administrative $ 337 $ 384 $ 1,202 $ 1,619 Research and development 334 373 1,684 1,194 Total $ 671 $ 757 $ 2,886 $ 2,813 Primarily as result of the workforce reduction discussed in Note 10, approximately 1,718,000 options were forfeited during the nine months ended September 30, 2016. We issued approximately 17,000 and 292,000 shares of common stock following the exercise of underlying stock options in the nine months ended September 30, 2017 and 2016, respectively. The fair value of each stock option issued was estimated at the date of grant using the Black-Scholes option model with the following weighted-average assumptions: Nine Months 2017 2016 Expected volatility 74 % 75 % Expected term (years) 5.69 6.20 Risk-free interest rate 1.81 % 1.42 % Expected dividend yield 0 % 0 % We issued approximately 117,000 option grants in the nine months ended September 30, 2017. The weighted-average grant date fair value per share of options granted during the nine months ended September 30, 2017 was $0.95. We issued approximately 1,164,000 option grants in the nine months ended September 30, 2016. The weighted-average grant date fair value per share of options granted during the nine months ended September 30, 2016 was $6.69. |