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Stock Award Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Stock Based Award Plans | The following table summarizes information about the Company’s stock-based award plans as of December 31, 2023:
|  | Outstanding Options |  |  | Outstanding Restricted Stock Units |  |  | Shares Available for Future Issuance |
2013 Equity Incentive Plan |  |  | 2,966,524 |  |  |  | — |  |  |  | — |
2018 Equity Incentive Plan |  |  | 5,434,087 |  |  |  | 12,363,934 |  |  |  | 26,374,063 |
Total |  |  | 8,400,611 |  |  |  | 12,363,934 |  |  |  | 26,374,063 |
Stock Based Compensation Expense Recognized in Consolidated Statements of Operations by Category | Total stock-based compensation expense recognized in the consolidated statements of operations is included in the following categories (in thousands):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |  |  | 2021 |
Cost of goods sold |  | $ | 1,589 |  |  | $ | 329 |  |  | $ | 407 |
Cost of revenue — collaborations and services |  |  | 897 |  |  |  | 1,425 |  |  |  | 1,708 |
Research and development |  |  | 1,442 |  |  |  | 1,044 |  |  |  | 614 |
Selling |  |  | 2,291 |  |  |  | 1,194 |  |  |  | 2,578 |
General and administrative |  |  | 11,430 |  |  |  | 9,455 |  |  |  | 6,893 |
Total |  | $ | 17,649 |  |  | $ | 13,447 |  |  | $ | 12,200 |
Summary of Stock Options Outstanding | The following table summarizes information relating to stock options:
|  | Number of Shares |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value ($000) |
Outstanding as of January 1, 2023 |  |  | 9,074,587 |  |  | $ | 3.06 |  |  |  | 5.10 |  |  | $ | 29,512 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |
Exercised |  |  | (445,376 | ) |  |  | 1.57 |  |  |  |  |  |  |
Forfeited |  |  | (3,420 | ) |  |  | 2.53 |  |  |  |  |  |  |
Expired |  |  | (225,180 | ) |  |  | 30.97 |  |  |  |  |  |  |
Outstanding as of December 31, 2023 |  |  | 8,400,611 |  |  | $ | 2.39 |  |  |  | 4.07 |  |  | $ | 15,153 |
Exercisable as of December 31, 2023 |  |  | 7,938,892 |  |  | $ | 2.40 |  |  |  | 4.12 |  |  | $ | 14,450 |
Summary of Restricted Stock Unit Activity | The following table summarizes information relating to restricted stock units:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value per Share |
Outstanding as of January 1, 2023 |  |  | 11,838,329 |  |  | $ | 3.65 |
Granted |  |  | 7,531,650 |  |  |  | 5.17 |
Vested |  |  | (6,053,264 | ) |  |  | 3.41 |
Forfeited |  |  | (952,781 | ) |  |  | 4.80 |
Outstanding as of December 31, 2023 |  |  | 12,363,934 |  |  |  | 4.61 |

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