Stockholders' equity | Stockholders’ equity In May 2018, the Company’s shareholders approved a reduction in the number of authorized shares of stock from 240 million to 55 million , of which 5 million are authorized as preferred stock and 50 million as common stock. Recent issuances In January 2018, the Company completed a public offering of 3,692,307 Common Shares and warrants for 4,246,153 Common Shares. Net proceeds to the Company were $10.6 million after deducting discounts, fees, and expenses. Intrexon Corporation, the Company’s majority shareholder, participated in the offering, purchasing 1,538,461 Common Shares and warrants for 1,538,461 Common Shares for gross proceeds of $5.0 million . As of September 30, 2018 , the Company has issued 249,824 Common Shares in conjunction with the exercise of warrants, with total proceeds of $811,928 . Warrants In connection with the public offering of Common Shares that was completed in January 2018, the Company issued warrants to purchase 4,246,153 Common Shares. Each warrant has an exercise price per share of $3.25 , is immediately exercisable, and will expire five years from the date of issuance. The following table summarizes information about outstanding warrants at September 30, 2018 : Number of warrant shares Weighted average exercise price Outstanding at December 31, 2017 — $ — Issued 4,246,153 3.25 Exercised (249,824 ) 3.25 Outstanding at September 30, 2018 3,996,329 $3.25 Exercisable at September 30, 2018 3,996,329 $3.25 Share-based compensation Restricted stock A summary of the Company’s shares of restricted stock as of September 30, 2018 , is as follows: Shares Weighted average grant date fair value Balance at December 31, 2017 2,697 $11.37 Granted 11,151 2.50 Vested (3,645 ) 5.63 Balance at September 30, 2018 10,203 $3.73 During the nine months ended September 30, 2018 and 2017 , the Company expensed $20,421 and $19,235 , respectively, related to the restricted stock awards. At September 30, 2018 , the balance of unearned share-based compensation to be expensed in future periods related to the restricted stock awards is $37,891 . The period over which the unearned share-based compensation is expected to be earned is approximately 2.4 years. Stock options The Company’s option activity is summarized as follows: Number of options Weighted average exercise price Outstanding at December 31, 2017 227,203 $9.39 Issued 113,561 2.50 Expired (800 ) 9.90 Outstanding at September 30, 2018 339,964 $7.09 Exercisable at September 30, 2018 271,467 $7.30 Unless otherwise indicated, options issued to employees, members of the Board of Directors, and non-employees are vested over one to three years and are exercisable for a term of ten years from the date of issuance. The weighted average fair value of stock options granted during the nine months ended September 30, 2018 , was $1.65 . The total intrinsic value of all options outstanding was $80,628 and $17,454 at September 30, 2018 , and December 31, 2017 , respectively. The total intrinsic value of exercisable options was $47,491 and $17,454 at September 30, 2018 , and December 31, 2017 , respectively. The following table summarizes information about options outstanding and exercisable at September 30, 2018 : Weighted average exercise price of outstanding options Number of options outstanding Weighted average remaining estimated life (in years) Number of options exercisable Weighted average exercise price of outstanding and exercisable options $2.50 - $5.70 204,034 5.9 157,362 $6.90 - $9.60 53,175 4.0 53,175 $10.50 - $10.80 4,000 5.4 4,000 $14.20 - $23.40 78,755 7.5 56,930 339,964 271,467 $7.30 Total share-based compensation on stock-option grants amounted to $171,261 and $66,208 for the nine months ended September 30, 2018 and 2017 , respectively. At September 30, 2018 , the balance of unearned share-based compensation to be expensed in future periods related to unvested share-based awards was $176,080 . The period over which the unearned share-based compensation is expected to be earned is approximately 1.4 years. |