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Share-Based Compensation Expense | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Share-Based Compensation Expense | Stock-Based Compensation Expense Stock-based compensation expense for stock options and restricted stock units for the years ended December 31, 2023 and 2022 was $2.9 million and $10.0 million, respectively. As of December 31, 2023, there was $7.1 million of unrecognized compensation cost, respectively, related to stock options and restricted stock units which is expected to be recognized over the remaining vesting periods, with a weighted-average period of 2.8 years. Stock Options The Company grants stock options to certain employees that will vest over a period of one to four years. A summary of stock option award activity for the years ended December 31, 2023 and 2022 was as follows:
Options |  | Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term
Outstanding at December 31, 2021 |  | 1,217,161 |  |  | $ | 11.20 |  |  | 7.2
Granted |  | 5,435 |  |  | 15.60 |  |  |
Exercised |  | (333,102) |  |  | 1.92 |  |  |
Cancelled or forfeited |  | (128,086) |  |  | 35.36 |  |  |
Outstanding at December 31, 2022 |  | 761,408 |  |  | $ | 11.12 |  |  | 2.7
Granted |  | — |  |  | — |  |  |
Exercised |  | (489,436) |  |  | 1.94 |  |  |
Cancelled or forfeited |  | (78,816) |  |  | 51.48 |  |  |
Outstanding at December 31, 2023 |  | 193,156 |  |  | $ | 17.89 |  |  | 5.8
Exercisable at December 31, 2023 |  | 191,635 |  |  | $ | 17.50 |  |  | 5.8
The aggregate intrinsic value of stock options outstanding as of December 31, 2023 and 2022 was $0.3 million and $3.3 million, respectively. Cash received from options exercised for the years ended December 31, 2023 and 2022 was approximately $0.9 million and $0.6 million, respectively. There were no stock options issued during the year ended December 31, 2023. The fair value of stock options issued during the year ended December 31, 2022 was measured with the following assumptions:
|  | 2022
Expected volatility |  | 78.1-88.2%
Expected term (in years) |  | 6.25
Risk-free interest rate |  | 0.1-1.3%
Expected dividend yield |  | 0.0 | %
Restricted Stock Units The Company grants restricted stock units to certain employees that will generally vest over a period of four years. The fair value of restricted stock unit awards is estimated by the fair value of the Company’s common stock at the date of grant. Restricted stock units activity during the years ended December 31, 2023 and 2022 was as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Non-vested, at December 31, 2021 | 75,554 |  |  | $ | 48.48 |
Granted | 1,404,870 |  |  | 9.60 |
Vested | (132,792) |  |  | 14.40 |
Cancelled or forfeited | (118,543) |  |  | 21.60 |
Non-vested, at December 31, 2022 | 1,229,089 |  |  | $ | 10.40 |
Granted | 693,506 |  |  | 6.36 |
Vested | (531,029) |  |  | 12.55 |
Cancelled or forfeited | (289,471) |  |  | 10.10 |
Non-vested, at December 31, 2023 | 1,102,095 |  |  | $ | 7.74 |
Restricted Stock Award Modifications In connection with the sale of the Company’s Drivetrain business to Shyft which closed in January 2023, the Company modified certain stock awards to employees of the Drivetrain business who were terminated in December 2022 and subsequently commenced employment at Shyft. The modification consisted of the acceleration of the vesting of all awards including stock options and restricted stock units scheduled to vest in 2023, which would have otherwise been forfeited. The vesting date of these awards was accelerated to December 31, 2022, resulting in an incremental stock based compensation expense of $0.3 million in 2022. CEO's Ladder Restricted Stock Unit Award On September 9, 2022, in connection with the acquisition of Legacy Spruce Power and his appointment as the Company's President, the Company granted to its CEO a restricted stock unit award (the “Ladder RSUs”) of 208,333 shares of common stock. The Ladder RSUs vest in 10% increments on the dates the Plan administrator certifies the applicable milestone stock prices have been achieved or exceeded, provided that the CEO remains employed on the date of certification and such achievement occurs within ten years of the date of the grant. The Company used a Monte Carlo simulation valuation model to determine the fair value of the award as of the Acquisition Date, which is presently accounted for as a liability. The following inputs were used in the simulation: grant date stock price of $9.36 per share, annual volatility of 85.0%, risk-free interest rate of 3.3% and dividend yield of 0.0%. For each tranche, a fair value was calculated as well as a derived service period which represents the median number of years it is expected to take for the Ladder RSUs to meet their corresponding milestone stock price excluding the simulation paths that result in the Ladder RSUs not vesting within the 10-year term of the agreement. Each tranche's fair value will be amortized ratably over the respective derived service period. The fair value and derived service period of each tranche was as follows:
Stock Price Tranche |  | Fair Value |  | Derived Service Period (in years)
$25.84 |  | $8.88 |  | 1.72
42.96 |  | 8.48 |  | 2.71
60.00 |  | 8.24 |  | 3.30
77.12 |  | 7.92 |  | 3.70
94.16 |  | 7.76 |  | 4.11
111.28 |  | 7.52 |  | 4.42
128.32 |  | 7.28 |  | 4.64
145.44 |  | 7.12 |  | 4.78
162.48 |  | 6.96 |  | 5.00
179.60 |  | 6.80 |  | 5.10
The Company recognized expense related to the Ladder RSUs of approximately $0.5 million and $0.1 million for the years ended December 31, 2023 and 2022.

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