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Stock-Based Compensation | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2018
Share-based Payment Arrangement [Abstract] |  |
Stock-Based Compensation | NOTE 8 - STOCK-BASED COMPENSATION Equity Incentive Plans The Company has issued equity awards pursuant to its 2015 Equity Incentive Plan (the “2015 Plan”), 2009 Stock Plan and 2008 Stock Plan (collectively the “Plans”). The Plans permit the Company to grant non-statutory stock options, incentive stock options and other equity awards to the Company’s employees, outside directors and consultants; however, incentive stock options may only be granted to the Company’s employees. Beginning June 29, 2015, no further awards may be granted under the 2008 Stock Plan or 2009 Stock Plan. However, to the extent awards under the 2008 Plan or 2009 Plan are forfeited or lapse unexercised or are settled in cash, the common stock subject to such awards will be available for future issuance under the 2015 Plan. On June 2, 2017, the stockholders of the Company approved an amendment to the 2015 Plan at the 2017 annual meeting of stockholders, which among other things, increased the number of shares that may be issued pursuant to awards under the 2015 Plan by 83,800 shares of common stock. On September 15, 2017, the stockholders of the Company approved an amendment to the 2015 Plan at a special meeting of stockholders, which among other things, increased the number of shares that may be issued pursuant to awards under the 2015 Plan by 2,585,871 shares of common stock. As of September 30, 2019, the aggregate number of shares of common stock authorized for issuance under the 2015 Plan, as amended, was 2,750,000 and 183,124 shares were available for issuance as of September 30, 2019. The following represents a summary of the options granted to employees and non-employees that are outstanding at September 30, 2019 and changes during the period then ended:
|  | Options |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Weighted Average Remaining Contractual Life (in years) |
Outstanding at December 31, 2018 |  |  | 673,885 |  |  | $ | 19.82 |  |  | $ | ― |  |  |  | 8.2 |
Granted |  |  | 698,750 |  |  | $ | 0.62 |  |  | $ | ― |  |  |  | 9.0 |
Exercised/ Expired/ Forfeited |  |  | (28,500 | ) |  | $ | 0.98 |  |  | $ | ― |  |  |  | ― |
Outstanding at September 30, 2019 |  |  | 1,344,135 |  |  | $ | 10.24 |  |  | $ | ― |  |  |  | 8.4 |
Exercisable at September 30, 2019 |  |  | 531,528 |  |  | $ | 28.66 |  |  | $ | ― |  |  |  | 7.4 |
The exercise price for an option issued under the 2015 Plan is determined by the Board of Directors, but will be (i) in the case of an incentive stock option (A) granted to an employee who, at the time of grant of such option, is a 10% stockholder, no less than 110% of the fair market value per share on the date of grant; or (B) granted to any other employee, no less than 100% of the fair market value per share on the date of grant; and (ii) in the case of a non-statutory stock option, no less than 100% of the fair market value per share on the date of grant. The options awarded under the Plans will vest as determined by the Board of Directors but will not exceed a ten-year period. Fair Value of Equity Awards The Company utilizes the Black-Scholes option pricing model to value awards under its Plans. Key valuation assumptions include:
● | Expected dividend yield. The expected dividend is assumed to be zero as the Company has never paid dividends and has no current plans to pay any dividends on the Company’s common stock.
● | Expected stock-price volatility. As the Company’s common stock only recently became publicly traded, the expected volatility is derived from the average historical volatilities of publicly traded companies within the Company’s industry that the Company considers to be comparable to the Company’s business over a period approximately equal to the expected term and the Company.
● | Risk-free interest rate. The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant for zero coupon U.S. Treasury notes with maturities approximately equal to the expected term.
● | Expected term. The expected term represents the period that the stock-based awards are expected to be outstanding. The Company’s historical share option exercise experience does not provide a reasonable basis upon which to estimate an expected term because of a lack of sufficient data. Therefore, the Company estimates the expected term by using the simplified method provided by the SEC. The simplified method calculates the expected term as the average of the time-to-vesting and the contractual life of the options.
The material factors incorporated in the Black-Scholes model in estimating the fair value of the options granted for the periods presented were as follows (three months ended September 30, 2018 stock price adjusted for 1-for-10 reverse stock split):
|  | For the three months ended September 30, |  |  | For the nine months ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
Expected stock-price volatility |  |  | 69.00% – 69.38 | % |  |  | 48.89% – 50.22 | % |  |  | 46.33% – 69.38 | % |  |  | 46.47% – 53.11 | %
Risk-free interest rate |  |  | 1.47% – 1.54 | % |  |  | 2.78% – 3.07 | % |  |  | 1.47% – 2.60 | % |  |  | 2.46% – 3.07 | %
Expected average term of options |  |  | 5 –7 |  |  |  | 7 – 10 |  |  |  | 5 – 7 |  |  |  | 5 – 10 |
Stock price |  | $ | 1.04 |  |  | $ | 1.85 – $2.22 |  |  | $ | 0.60 – $1.04 |  |  | $ | 1.85 – $3.40 |
Restricted Stock Units Certain employees and consultants have been awarded restricted stock units. The restricted stock units include either milestone or time-based vesting. The following table summarizes restricted stock unit activity for the nine months ended September 30, 2019:
|  | Number of Units |  |  | Weighted Average Grant Date Fair Value |
Unvested at December 31, 2018 |  |  | 1,100,000 |  |  | $ | 2.73 |
Granted |  |  | 35,000 |  |  |  | 0.63 |
Forfeited |  |  | ― |  |  |  | ― |
Expired |  |  | (35,000 | ) |  |  | 0.63 |
Unvested at September 30, 2019 |  |  | 1,100,000 |  |  | $ | 2.73 |
Stock-Based Compensation The Company recognized stock-based compensation expense for services within general and administrative expense in the accompanying statements of operations of approximately $95,000 and $171,000 for the three months ended September 30, 2019 and 2018, respectively, and $364,000 and $562,000 for the nine months ended September 30, 2019 and 2018, respectively. As of September 30, 2019, there was approximately $334,000 of total unrecognized compensation cost related to unvested stock-based compensation arrangements. This cost is expected to be recognized over a weighted average period of 1.46 years. No stock options were exercised during the nine months ended September 30, 2019. | NOTE 8 — STOCK-BASED COMPENSATION Equity Incentive Plans The Company has issued equity awards pursuant to its 2015 Equity Incentive Plan (the “2015 Plan”), 2009 Stock Plan and 2008 Stock Plan (collectively the “Plans”). The Plans permit the Company to grant non-statutory stock options, incentive stock options and other equity awards to the Company’s employees, outside directors and consultants; however, incentive stock options may only be granted to the Company’s employees. Beginning June 29, 2015, no further awards may be granted under the 2009 Stock Plan or 2008 Stock Plan. However, to the extent awards under the 2008 Plan or 2009 Plan are forfeited or lapse unexercised or are settled in cash, the common stock subject to such awards will be available for future issuance under the 2015 Plan. In June 2017, the stockholders of the Company approved an amendment to the 2015 Plan at the 2017 annual meeting of stockholders, which among other things, increased the number of shares that may be issued pursuant to awards under the 2015 Plan by 83,800 shares of common stock. In September 2017, the stockholders of the Company approved an amendment to the 2015 Plan at a special meeting of stockholders, which among other things, increased the number of shares that may be issued pursuant to awards under the 2015 Plan by 2,585,871 shares of common stock. As of December 31, 2018, the aggregate number of shares of common stock authorized for issuance under the 2015 Plan, as amended, was 2,750,000, and 2,263,374 shares were available for issuance as of December 31, 2018. The following represents a summary of the options granted to employees and non-employees that are outstanding at December 31, 2018 and changes during the period then ended:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Weighted- Average Remaining Contractual Life (in years) |
Outstanding at December 31, 2017 |  |  | 254,171 |  |  | $ | 47.43 |  |  | $ | ― |  |  |  | 7.3 |
Options granted |  |  | 456,718 |  |  |  | 3.16 |  |  |  | ― |  |  |  | 8.6 |
Options forfeited |  |  | (37,004 | ) |  |  | 3.90 |  |  |  | ― |  |  |  | ― |
Outstanding at December 31, 2018 |  |  | 673,885 |  |  |  | 19.82 |  |  |  | ― |  |  |  | 8.2 |
Exercisable at December 31, 2018 |  |  | 290,818 |  |  | $ | 50.19 |  |  | $ | ― |  |  |  | 6.9 |
The exercise price for an option issued under the Plans is determined by the Board of Directors, but will be (i) in the case of an incentive stock option (A) granted to an employee who, at the time of grant of such option, is a 10% stockholder, no less than 110% of the fair market value per share on the date of grant; or (B) granted to any other employee, no less than 100% of the fair market value per share on the date of grant; and (ii) in the case of a non-statutory stock option, no less than 100% of the fair market value per share on the date of grant. The options awarded under the Plans will vest as determined by the Board of Directors but will not exceed a ten-year period. The weighted average grant date fair value per share of options granted during the year ended December 31, 2018 was $0.90. Fair Value of Equity Awards The Company utilizes the Black-Scholes option pricing model to value awards under its Plans. Key valuation assumptions include:
● | Expected dividend yield. The expected dividend is assumed to be zero as the Company has never paid dividends and has no current plans to pay any dividends on the Company’s common stock.
● | Expected stock-price volatility. As the Company’s common stock only recently became publicly traded, the expected volatility is derived from the average historical volatilities of publicly traded companies within the Company’s industry that the Company considers to be comparable to the Company’s business over a period approximately equal to the expected term.
● | Risk-free interest rate. The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant for zero coupon U.S. Treasury notes with maturities approximately equal to the expected term.
● | Expected term. The expected term represents the period that the stock-based awards are expected to be outstanding. The Company’s historical share option exercise experience does not provide a reasonable basis upon which to estimate an expected term because of a lack of sufficient data. Therefore, the Company estimates the expected term by using the simplified method provided by the SEC. The simplified method calculates the expected term as the average of the time-to-vesting and the contractual life of the options.
The material factors incorporated in the Black-Scholes model in estimating the fair value of the options granted for the periods presented were as follows (adjusted for 1-for-10 reverse stock split):
|  | For the year ended December 31, |
|  | 2018 |  |  | 2017 |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Expected stock-price volatility |  |  | 46.47% - 53.11 | % |  |  | 53.08% - 54.08 | %
Risk-free interest rate |  |  | 2.46% - 3.07 | % |  |  | 1.89% - 2.58 | %
Term of options |  |  | 5 - 10 |  |  |  | 10 |
Stock price |  | $ | 1.85 - $3.40 |  |  | $ | 0.30 - $3.48 |
Stock-Based Compensation The Company recognized stock-based compensation expense for services within general and administrative expense in the accompanying statements of operations of approximately $646,000 and $895,000 for the years ended December 31, 2018 and 2017, respectively. As of December 31, 2018, there was approximately $469,000 of total unrecognized compensation cost related to unvested stock-based compensation arrangements. This cost is expected to be recognized over a weighted average period of 1.6 years. No stock options were exercised during the year ended December 31, 2018 and 2017.

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