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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | STOCK-BASED COMPENSATION 2020 and 2016 Equity Incentive Plans The Company's Board of Directors and stockholders adopted and approved the Company's 2020 Equity Incentive Plan (the “2020 Plan”) on October 8, 2020. The 2020 Plan replaced the Company's 2016 Equity Incentive Plan that was earlier adopted in December 2016 (the “2016 Plan”). However, awards outstanding under the 2016 Plan will continue to be governed by its original terms. The number of shares of the Company's common stock that were initially available for issuance under the 2020 Plan equaled the initial sum of 9,000,000 shares plus 2,432,980 shares that were then available for issuance under the 2016 Plan. The 2020 Plan provides for the following types of awards: incentive and non-statutory stock options, stock appreciation rights, restricted shares, and restricted stock units. The number of shares of common stock reserved for issuance under the 2020 Plan are increased automatically on the first business day of each fiscal year, commencing in 2021 and ending in 2030, by a number equal to the lesser of: (i) 4% of the shares of common stock outstanding on the last day of the prior fiscal year; or (ii) the number of shares determined by the Company's Board of Directors. In general, to the extent that any awards under the 2020 Plan are forfeited, terminate, expire or lapse without the issuance of shares, or if the Company reacquires the shares subject to awards granted under the 2020 Plan, those shares will again become available for issuance under the 2020 Plan, as will shares applied to pay the exercise or purchase price of an award or to satisfy tax withholding obligations related to any award. Stock-based awards are governed by agreements between the Company and the recipients. Incentive stock options and nonqualified stock options may be granted under the 2020 Plan (and previously the 2016 Plan) at an exercise price of not less than 100% of the fair market value of common stock on the respective date of grant. The grant date is the date the terms of the award are formally approved by the Company’s Board of Directors or its designee. Through June 30, 2021, all awards issued under the 2020 Plan and 2016 Plan were in the form of stock options and restricted stock units. These stock award agreements have service and/or performance conditions for vesting, unless immediately vested on the date of grant. Stock awards granted typically have one to four-year service conditions for full vesting. The performance conditions for vesting are explicitly stated in each award agreement and are associated with clinical, business development, or operational milestones. Stock options must be exercised, if at all, no later than 10 years from the date of grant. Upon termination of employment, vested stock options may be exercised within 12 months after the date of termination upon death, six months after the date of termination upon disability, and three months after the date of termination for all other separations. Stock-Based Compensation Summary Stock-based compensation expense is recorded in the accompanying condensed statements of operations and comprehensive income (loss) based on the assigned or designated department of the award recipient. Stock-based compensation expense for the three and six months ended June 30, 2021 and 2020 was as follows:
| Three months ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Research and development | $ | 427 |  |  | $ | 14 |  |  | $ | 771 |  |  | $ | 15 |
General and administrative | 2,367 |  |  | 159 |  |  | 3,386 |  |  | 162 |
Total stock-based compensation | $ | 2,794 |  |  | $ | 173 |  |  | $ | 4,157 |  |  | $ | 177 |
Pre-Vesting Exercise Feature of Certain Stock Options The 2016 Plan permitted certain option holders to exercise awarded options prior to vesting. Upon this early exercise, the options became subject to a restricted stock agreement and remain subject to the same vesting provisions in the corresponding stock option award. These unvested options are subject to repurchase by the Company upon employee termination at the same price exercised. These unvested shares of common stock are reported as issued (but not outstanding) on the accompanying Balance Sheets while subject to repurchase by the Company. These shares are also excluded from the basic net income (loss) per share until the repurchase right lapses upon vesting, but are included in the diluted net income per share for the three and six months ended June 30, 2021. The Company initially records a liability for these early exercises that is subsequently reclassified into stockholders’ equity on a pro rata basis as vesting occurs. As of June 30, 2021 and December 31, 2020, the Company recorded the unvested portion of the exercise proceeds of $0.3 million and $0.4 million, respectively, as a liability from the early exercise in the accompanying Balance Sheets.

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