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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 | Stock-Based Compensation As of June 30, 2023, 7,835,715 shares of common stock had been authorized for issuance under our 2021 Equity and Incentive Compensation Plan (“2021 Plan”) and 6,287,687 shares of common stock were originally reserved for issuance under our 2018 Equity Incentive Plan (“2018 Plan”); however, no further grants may be made pursuant to the 2018 Plan. Stock Option Activity A summary of the stock option activity under our equity incentive plans is as follows:
| Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (in thousands)
Balance – December 31, 2022 | 2,599,264 |  |  | $ | 8.41 |  |  | 7.2 |  | $ | — |
Granted | — |  |  | — |  |  | — |  |  | — |
Exercised | — |  |  | — |  |  | — |  |  | — |
Forfeited and cancelled | (102,770) |  |  | $ | 22.14 |  |  | — |  |  | — |
Balance – June 30, 2023 | 2,496,494 |  |  | $ | 7.85 |  |  | 6.3 |  | $ | — |
Exercisable – June 30, 2023 | 2,260,042 |  |  | $ | 7.40 |  |  | 6.1 |  | $ | — |
Vested and expected to vest as of June 30,2023 | 2,496,494 |  |  | $ | 7.85 |  |  | 6.3 |  | $ | — |
There were no options granted in the first or second quarter of 2023 or 2022. Restricted Stock Units A summary of r estricted stock unit activity under our equity incentive plans is as follows:
| Number of Awards |  | Weighted- Average Grant Date Fair Value per Share
Unvested and outstanding balance at December 31, 2022 | 2,058,534 |  |  | $ | 12.79 |
Granted | — |  |  | — |
Vested | (817,978) |  |  | 13.11 |
Forfeited | (174,275) |  |  | 20.23 |
Unvested and outstanding balance at June 30, 2023 | 1,066,281 |  |  | $ | 11.32 |
The total fair value of restricted stock units that vested during the three months ended June 30, 2023 and 2022 was approximately $1.2 million and $0.2 million, respectively. The total fair value of restricted stock units that vested during the six months ended June 30, 2023 and 2022 was approximately $1.6 million and $3.1 million, respectively. We had 32,580 outstanding and fully vested restricted stock units remained unsettled at June 30, 2023, all of which are expected to be settled in 2023. As such, they are excluded from outstanding shares of common stock but are included in weighted-average shares outstanding for the calculation of net loss per share for the three and six months ended June 30, 2023 and 2022. There was no activity with respect to performance-based restricted stock units during the three and six months ended June 30, 2023. Performance-based restricted stock units for 1,089,045 shares were unvested and outstanding as of June 30, 2023 and December 31, 2022. Stock-Based Compensation Expense Stock-based compensation expense under our equity incentive plans was as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Cost of sales (1) | $ | (826) |  |  | $ | 764 |  |  | $ | (453) |  |  | $ | 1,643 |
Selling and administrative expenses (2) | 3,977 |  |  | 3,983 |  |  | 8,823 |  |  | 9,643 |
Total | $ | 3,151 |  |  | $ | 4,747 |  |  | $ | 8,370 |  |  | $ | 11,286 |
(1) Cost of sales for the three and six months ended June 30, 2023 includes a net reversal of $1.1 million of stock-based compensation expense associated with equity awards granted to an independent contractor for services pursuant to the terms of a license services and collaboration agreement. Stock-based compensation expense associated with equity awards granted to an independent contractor for services pursuant to the terms of a license, services and collaboration agreement and recorded in cost of sales for the three and six months ended June 30, 2022 were $0.6 million and $0.7 million, respectively. (2) Selling and administrative expenses for the three and six months ended June 30, 2023 includes $1.3 million and $2.3 million of accelerated amortization of stock-based compensation expense for certain equity awards during the three and six months ended June 30, 2023, respectively. The expense presented in the table above is net of capitalized stock-based compensation relating to software development costs of $0.5 million and $1.2 million during the three and six months ended June 30, 2023, respectively, and $0.6 million during the three and six months ended June 30, 2022. At June 30, 2023, unrecognized compensation cost related to unvested stock options was $1.2 million and is expected to be recognized over the remaining weighted-average service period of 0.74 years. At June 30, 2023, total unrecognized compensation cost related to unvested performance-based stock units and restricted stock units was $13.7 million and is expected to be recognized over the remaining weighted-average service period of 1.91 years.

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