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Stock Based Compensation | 6 Months Ended
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Jun. 30, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Stock Based Compensation |
6. | Stock-Based Compensation
2018 Omnibus Incentive Plan In June 2018, stockholders of the Company approved the Company’s 2018 Omnibus Incentive Plan (the “2018 Plan”). The 2018 Plan had previously been approved by the Company’s Board of Directors (the “Board”) and the Compensation Committee (the “Committee”) of the Board, subject to stockholder approval. The 2018 Plan became effective on June 13, 2018. On June 9, 2021, the stockholders of the Company approved an amendment previously approved by the Board to increase the number of shares of common stock reserved for issuance under the 2018 Plan by 2,500,000 to a total of 5,300,000 shares. The amendment became effective immediately upon stockholder approval. Performance-Based Stock Option Grant In June 2022, the Committee approved the issuance of an option grant to purchase 400,000 shares of common stock to the Chief Executive Officer pursuant to the 2018 Plan, which will vest upon (a) the achievement of a specified performance goal and (b) the grantees’ continued employment during the service period. For the six months ended June 30, 2022, no expense has been recognized related to this award. The following table summarizes stock option activity under the Company’s 2018 Plan and related information:
|  | Number of Shares Underlying Outstanding Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (Years) |
Outstanding — December 31, 2021 |  |  | 2,603,630 |  |  | $ | 7.70 |  |  |  | 7.46 |
Options granted |  |  | 1,314,200 |  |  | $ | 0.72 |  |  |  |  |
Options forfeited |  |  | (1,173,227 | ) |  | $ | 4.19 |  |  |  |  |
Options expired |  |  | (47,192 | ) |  | $ | 12.84 |  |  |  |  |
Outstanding — June 30, 2022 |  |  | 2,697,411 |  |  | $ | 5.64 |  |  |  | 7.85 |
Exercisable — June 30, 2022 |  |  | 1,375,625 |  |  | $ | 9.01 |  |  |  |  |
Valuation Assumptions The Company estimated the fair value of stock options granted using the Black-Scholes option-pricing formula and a single option award approach. Due to its limited relevant historical data, the Company estimated its volatility considering a number of factors including the use of the volatility of comparable public companies. The expected term of options granted under the Plan, all of which qualify as “plain vanilla” per SEC Staff Accounting Bulletin 107, is determined based on the simplified method due to the Company’s limited relevant history. The risk-free rate is based on the yield of a U.S. Treasury security with a term consistent with the option. This fair value is being amortized ratably over the requisite service periods of the awards, which is generally the vesting period. The fair value of employee stock options was estimated using the following weighted-average assumptions:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Employee Stock Options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free rate |  |  | 2.93 | % |  |  | 0.96 | % |  |  | 2.22 | % |  |  | 0.74 | %
Expected term (in years) |  |  | 6.0 |  |  |  | 5.7 |  |  |  | 6.0 |  |  |  | 6.0 |
Dividend yield |  | — |  |  | — |  |  | — |  |  | — |
Volatility |  |  | 91.82 | % |  |  | 92.79 | % |  |  | 91.63 | % |  |  | 93.64 | %
Weighted-average fair value of stock options granted |  | $ | 0.87 |  |  | $ | 3.37 |  |  | $ | 0.55 |  |  | $ | 4.45 |
Total stock-based compensation expense recognized was as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Research and development |  | $ | 83 |  |  | $ | 394 |  |  | $ | 211 |  |  | $ | 763 |
General and administrative(1) |  |  | 263 |  |  |  | 589 |  |  |  | 650 |  |  |  | 1,246 |
Total stock-based compensation expense |  | $ | 346 |  |  | $ | 983 |  |  | $ | 861 |  |  | $ | 2,009 |
| (1) | Included in general and administrative stock-based compensation for the six months ended June 30, 2022 is stock-based compensation expense related to 32,684 shares of common stock issued to certain board members in lieu of their cash compensation. No shares of common stock were issued to board members for the three months ended June 30, 2022.
As of June 30, 2022, 3,013,716 shares of common stock were available for future grant.

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