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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation Share and per share amounts below have been retroactively adjusted to reflect the exchange ratio and reverse stock split described in Note 1. 2017 Equity Incentive Plan On December 29, 2017, the 2017 Equity Incentive Plan was approved, and currently allows for the issuance of up to a maximum of approximately 1,686,000 shares of common stock in connection with the grant of stock-based awards, including stock options, restricted stock, restricted stock units, stock appreciation rights and other types of awards as deemed appropriate, not including shares subject to awards assumed in connection with certain transactions, including the Merger. Upon the consummation of the Merger, the Company assumed approximately 10,171 shares subject to outstanding common stock options granted under the Company’s 2016 Incentive Plan that remained exercisable through December 29, 2018 for former Company employees and directors. The number of shares reserved for issuance under the 2017 Equity Incentive Plan automatically increases on January 1 of each year, for a period of not more than ten years, commencing on January 1, 2018 and ending on (and including) January 1, 2027, in an amount equal to 4% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year. Notwithstanding the foregoing, the board of directors may act prior to January 1 of a given year to provide that there will be no January 1 increase in the share reserve for such year or that the increase in the share reserve for such year will be a lesser number of shares of common stock than would otherwise occur pursuant to the preceding sentence. The number of shares reserved for issuance under the 2017 Equity Incentive Plan was automatically increased to approximately 1,686,000 on January 1, 2019. As of December 31, 2018, an aggregate of approximately 381,000 shares of common stock were reserved for future grants under the Company’s 2017 Equity Incentive Plan. There were no common stock options granted under the 2017 Equity Incentive Plan for the year ended December 31, 2017. The following table summarizes the components of stock-based compensation expense in the consolidated statements of operations for the years ended December 31, 2018 and 2017, respectively (in thousands):
| Years Ended December 31,
| 2018 |  | 2017
Research and development | $ | 77 |  |  | $ | 729 |
General and administrative | 318 |  |  | 2,440 |
Total stock-based compensation | $ | 395 |  |  | $ | 3,169 |
Options to Purchase Shares of Common Stock The Company uses the Black-Scholes option-pricing model and the following assumptions were used to determine the weighted average fair value of all its stock options granted during the year ended December 31, 2018:
Risk free interest rate | 2.73 | %
Volatility | 80.83 | %
Expected lives (years) | 6.20 |
Expected dividend yield | — | %
The weighted-average grant date fair value of options granted during the year ended December 31, 2018 was $3.73. There were no stock options granted during the year ended December 31, 2017. The Company’s expected common stock price volatility assumption is based upon the Company's own implied volatility in combination with the implied volatility of a basket of comparable companies. The expected life assumptions for employee grants were based upon the simplified method, which averages the contractual term of the Company’s options of ten years with the average vesting term of four years for an average of six years. The expected life assumptions for non-employees were based upon the contractual term of the option. The dividend yield assumption is zero, because the Company has never paid cash dividends and presently has no intention to do so. The risk-free interest rate used for each grant was also based upon prevailing short-term interest rates. The Company accounts for forfeitures as they occur, therefore, outstanding stock options equal vested and expected to vest stock options. As of December 31, 2018, there was $0.9 million of unrecognized compensation cost related to outstanding stock options that is expected to be recognized as a component of the Company’s operating expenses over a weighted-average period of 2.13 years. The following table summarizes stock option activity of the Company for the year ended December 31, 2018:
| Total Number of Shares (In Thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2018 | 10 |  |  | $ | 1,240.55 |  |  | 1.00 |  | $ | — |
Granted | 483 |  |  | 5.24 |  |  |  |  | — |
Canceled | (98 | ) |  | 5.30 |  |  |  |  | $ | — |
Outstanding at December 31, 2018 | 395 |  |  | $ | 37.09 |  |  | 9.01 |  | $ | — |
Options exercisable at December 31, 2018 | 53 |  |  | $ | 241.17 |  |  | 7.63 |  | $ | — |
The aggregate intrinsic values of outstanding and exercisable stock options at December 31, 2018 were calculated based on the closing price of the Company’s common stock as reported on the Nasdaq Capital Market on December 31, 2018 of $1.23 per share. The aggregate intrinsic value equals the positive difference between the closing fair market value of the Company’s common stock and the exercise price of the underlying stock options. RSUs with Time-Based and Performance-Based Conditions The Company granted RSUs subject to both time-based and performance-based vesting conditions to certain of its employees and non-employees pursuant to the 2016 Incentive Plan. These RSUs vest based on both (i) continued service either over a three-year measurement period or at the end of the required service period and (ii) the achievement of a liquidity event. The initial vesting date for these RSUs was February 27, 2018. The liquidity event, as defined in the relevant RSU grant agreements, will be satisfied upon the earlier of either: (a) change of control or (b) a qualified public offering. As of December 31, 2018 and December 31, 2017, there were approximately 13,000 RSUs outstanding with a weighted average grant date fair value of $52.94. The Company recognizes compensation expense related to these RSUs when the liquidity event is deemed probable. As such, no compensation expense was recorded to date as the liquidity event is outside the Company’s control and not deemed probable until it occurs. 2017 Employee Stock Purchase Plan The Company also has an employee stock purchase plan (“ESPP”) which allows employees to contribute up to 15% of their cash earnings, subject to certain maximums, to be used to purchase shares of the Company’s common stock on each semi-annual purchase date. On each offering date, each eligible employee, pursuant to an offering made under the ESPP, will be granted a right to purchase up to that number of shares of common stock purchasable either with a percentage or with a maximum dollar amount, as designated by the Board of Directors, but in either case not exceeding fifteen percent (15%) of such employee’s earnings (as defined by the Board of Directors in each offering) during the period that begins on the offering date (or such later date as the Board of Directors determines for a particular offering) and ends on the date stated in the offering, which date will be no later than the end of the offering. As of December 31, 2018, the Board of Directors has not established the various parameters under the ESPP and no shares have been delivered under the ESPP. There are approximately 265,000 shares of common stock reserved for issuance under the ESPP, plus the number of shares of common stock that are automatically added on January 1st of each year for a period of up to ten years, commencing on the first January 1, 2018 and ending on (and including) January 1, 2027, in an amount equal to the lesser of (i) 1% of the total number of shares of common stock outstanding on December 31st of the preceding calendar year, and (ii) 150,000 shares of common stock.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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