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Stock-based Compensation | 6 Months Ended
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Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock-based Compensation | Note 10. Stock-based Compensation Legacy Stock Plans In May 2018, the Board of Directors of Momentus Inc. approved the 2018 Stock Plan (the “Initial Plan”) that allowed for granting of incentive and non-qualified stock options and restricted stock awards to employees, directors, and consultants. The Initial Plan was terminated in November 2018. Awards outstanding under the Initial Plan continue to be governed by the terms of the Initial Plan. In February and March 2020, the Board approved the Amended and Restated 2018 Stock Plan (the “2018 Plan”). No additional grants have been made since 2020 and no new grants will be made from the 2018 Plan, however, the options issued and outstanding under the plan continue to be governed by the terms of the 2018 Plan. Forfeitures from the legacy plans become available under the 2021 Equity Incentive Plan, described below. 2021 Equity Incentive Plan In connection with the Closing, the Company adopted the 2021 Equity Incentive Plan (the “2021 Plan”), under which 5,982,922 shares of Common Stock were initially reserved for issuance. The 2021 Plan allows for the issuance of incentive stock options (“ISOs”), non-qualified stock options (“NSOs”), restricted stock awards (“RSAs”), stock appreciation rights (“SARs”), restricted stock units (“RSUs”), and performance awards. The Board of Directors determines the period over which grants become exercisable. The 2021 Plan became effective immediately following the Closing. The 2021 Plan has an evergreen provision which allows for shares available for issuance under the plan to be increased on the first day of each fiscal year beginning with the 2022 fiscal year and ending on (and including) the first day of the 2031 fiscal year, in each case, in an amount equal to the lesser of (i) three percent (3.0%) of the outstanding shares on the last day of the immediately preceding fiscal year and (ii) such number of Shares determined by the Board. During the six months ended June 30, 2023, the shares available for grant under the 2021 Plan increased by 2,533,234 and 206,111 due to the evergreen provision and forfeitures from both the Initial Plan and the 2018 Plan, respectively. As of June 30, 2023, there were 1,275,145 shares remaining available for grant. Grant activity under the 2021 Plan is described below. 2021 Employee Stock Purchase Plan In connection with the Closing, the Company adopted the Employee Stock Purchase Plan (the “2021 ESPP Plan”), under which 1,595,445 shares of Common Stock were initially reserved for issuance. The Plan provides a means by which eligible employees of the Company may be given an opportunity to purchase shares of Common Stock at a discount as permitted under the Internal Revenue Code of 1986, as amended. The 2021 ESPP Plan has an evergreen provision which allows for shares available for issuance under the plan to be increased on the first day of each fiscal year beginning with the 2022 fiscal year and ending on (and including) the first day of the 2031 fiscal year, in each case, in an amount equal to the lesser of (i) half a percent (0.5%) of the outstanding shares on the last day of the calendar month prior to the date of such automatic increase and (ii) 1,595,445 shares. The 2021 ESPP Plan became effective immediately following the Closing. During the six months ended June 30, 2023, the shares available for issuance under the 2021 ESPP Plan increased by 422,205 due to the evergreen provision. During the six months ended June 30, 2023, there were 106,545 shares issued under the 2021 ESPP Plan. The Company has an outstanding liability pertaining to the ESPP of $0.03 million as of June 30, 2023, included in accrued expenses, for employee contributions to the 2021 ESPP Plan, pending issuance at the end of the offering period. As of June 30, 2023, there were 2,151,771 shares remaining available for issuance. 2022 Inducement Equity Plan In February 2022, the Company adopted the 2022 Inducement Equity Plan (the “2022 Plan”), under which 4,000,000 shares of Common Stock were initially reserved for issuance. The 2022 Plan allows for the issuance of NSOs, RSAs, SARs, RSUs, and stock bonus awards, subject to certain eligibility requirements. The Board of Directors determines the period over which grants become exercisable and grants generally vest over a four-year period. On March 21, 2023, the Company adopted the first amendment to the 2022 Plan to increase the number of shares of Common Stock available for issuance under the 2022 Plan from 4,000,000 shares of Common Stock to 7,000,000 shares of Common Stock. All other terms of the 2022 Plan remained the same. On May 8, 2023, the Company adopted the second amendment to the 2022 Plan to increase the number of shares of Common Stock available for issuance under the 2022 Plan from 7,000,000 shares of Common Stock to 8,000,000 shares of Common Stock. All other terms of the 2022 Plan remained the same. As of June 30, 2023, only RSU grants have been made under the 2022 Plan and there were 771,746 shares remaining available for issuance. Grant activity under the 2022 Plan is described below. Options Activity The following table sets forth the summary of options activity, under the 2018 Plan and the 2021 Plans, for the six months ended June 30, 2023:
(in thousands, except share-based data) |  |  |  |  |  |  |  | Total Options |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (In Years) |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2022 |  |  |  |  |  |  |  | 2,556,733 |  |  | $ | 1.21 |  |  |  |  |
Vested exercised |  |  |  |  |  |  |  | (502,704) |  |  | 0.26 |  |  |  |  |
Forfeitures |  |  |  |  |  |  |  | (691,906) |  |  | 1.87 |  |  |  |  |
Outstanding as of June 30, 2023 |  |  |  |  |  |  |  | 1,362,123 |  |  | $ | 1.24 |  |  | 7.0 |  | $ | 35 |
Exercisable as of June 30, 2023 |  |  |  |  |  |  |  | 917,812 |  |  | $ | 0.87 |  |  | 6.5 |  | $ | 31 |
Vested and expected to vest as of June 30, 2023 |  |  |  |  |  |  |  | 1,362,123 |  |  | $ | 1.24 |  |  | 7.0 |  | $ | 35 |
As of June 30, 2023, there was a total of $0.6 million in unrecognized compensation cost related to unvested options, which is expected to be recognized over a weighted-average period of 1.3 years. The total intrinsic value of options exercised during the three and six months ended June 30, 2023 was $0.01 million and $0.2 million, respectively, and during the three and six months ended June 30, 2022, and $3.7 million and $4.1 million, respectively. Restricted Stock Unit and Restricted Stock Award Activity The following table sets forth the summary of RSU and RSA activity, under the Initial Plan, the 2018 Plan, the 2021 Plan, and the 2022 Plan, for the six months ended June 30, 2023. RSAs were an immaterial portion of activity for the period:
|  | Shares |  | Weighted Average Grant Date Fair Value (i.e. Share Price)
Outstanding as of December 31, 2022 |  | 7,780,917 |  |  | $ | 3.99
Granted |  | 10,377,589 |  |  | 0.55 |
Vested |  | (1,238,805) |  |  | 2.99 |
Forfeited |  | (1,983,441) |  |  | 3.03 |
Outstanding as of June 30, 2023 |  | 14,936,260 |  |  | $ | 1.81 |
As of June 30, 2023, there was a total of $21.1 million in unrecognized compensation cost related to unvested RSUs, which is expected to be recognized over a weighted-average period of 1.7 years. Outstanding unvested and expected to vest RSUs had an intrinsic value of $4.7 million. Stock-based Compensation The following table sets forth the stock-based compensation under the Initial Plan, the 2018 Plan, the 2021 Plan, and the 2022 Plan by expense type:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Research and development expenses | $ | 681 |  |  | $ | 514 |  |  | $ | 1,157 |  |  | $ | 887 |
Selling, general and administrative expenses | 1,896 |  |  | 2,521 |  |  | 3,140 |  |  | 4,360 |
Total | $ | 2,577 |  |  | $ | 3,035 |  |  | $ | 4,297 |  |  | $ | 5,247 |
The following table sets forth the stock-based compensation under the Initial Plan, the 2018 Plan, the 2021 Plan, and the 2022 Plan by award type:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
Options | $ | 92 |  |  | $ | 174 |  |  | $ | 188 |  |  | $ | 251 |
RSUs & RSAs | 2,499 |  |  | 2,909 |  |  | 4,099 |  |  | 4,984 |
ESPP | (14) |  |  | 22 |  |  | 10 |  |  | 82 |
Performance Awards | $ | — |  |  | $ | (70) |  |  | — |  |  | (70) |
Total | $ | 2,577 |  |  | $ | 3,035 |  |  | $ | 4,297 |  |  | $ | 5,247 |
Performance Awards Performance awards under the 2021 Plan are accounted for as liability-classified awards, as the obligations are typically a fixed monetary amount which is settled on a future date in a variable number of shares of the Company’s Common Stock. The variable number of potentially settled shares is not limited. Performance awards are measured at their fair value based on management’s estimates of potential outcomes of the performance. Outstanding performance awards correspond to zero shares if they were settled on June 30, 2023. Issuance of Common Stock to Non-employees During the three months ended March 31, 2023, the Company issued 135,000 shares of the Company’s Common Stock to a third party consulting firm in exchange for public relations services. The shares were not issued under the equity incentive plans described above. Under the agreement, the shares are contingently forfeitable in the event of early termination by the Company. The shares had an issuance date fair value of $0.1 million to be recorded as consulting expense over the six-month term of the agreement. Related consulting expense was $0.05 million and $0.1 million for the three and six months ended June 30, 2023, respectively.

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