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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2026
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock Option Plan Activity | Activity under the 2021 EIP is set forth below:
|  | Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term in years |
|  | (In thousands) |  |  | (Per share data) |  |  | (Years) |
Outstanding as of December 31, 2024 |  |  | 18 |  |  | $ | 380.70 |  |  |  | 5.0 |
Granted |  |  | — |  |  | $ | — |  |  |  |
Exercised |  |  | — |  |  | $ | — |  |  |  |
Forfeited or expired |  |  | (14 | ) |  | $ | 166.70 |  |  |  |
Outstanding as of June 30, 2025 |  |  | 4 |  |  | $ | 1,022.11 |  |  |  | 4.8 |
Options vested and expected to vest as of June 30, 2025 |  |  | 4 |  |  | $ | 1,022.11 |  |  |  |
Vested and exercisable as of June 30, 2025 |  |  | 4 |  |  | $ | 1,022.11 |  |  |  |
Outstanding as of December 31, 2025 |  |  | 4 |  |  | $ | 1,028.92 |  |  |  | 4.4 |
Granted |  |  | 964 |  |  | $ | 18.40 |  |  |  |
Exercised |  |  | — |  |  | $ | — |  |  |  |
Forfeited or expired |  |  | — |  |  | $ | — |  |  |  |
Outstanding as of June 30, 2026 |  |  | 968 |  |  | $ | 22.78 |  |  |  | 10.0 |
Options vested and expected to vest as of June 30, 2026 |  |  | 968 |  |  | $ | 22.78 |  |  |  |
Vested and exercisable as of June 30, 2026 |  |  | 968 |  |  | $ | 22.78 |  |  |  |
Schedule of Weighted Average Grant Date Fair Value | The weighted-average grant-date fair value and significant assumptions used in the valuation were as follows:
|  | As of June 29, 2026 |
Weighted-average grant date fair value |  | $ | 16.80 |
Grant date stock price |  | $ | 18.40 |
Exercise price |  | $ | 18.40 |
Expected volatility |  |  | 165.0 | %
Expected term |  |  | 5.0 |
Risk-free interest rate |  |  | 4.1 | %
Expected dividend yield |  |  | 0.0 | %
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes outstanding and expected to vest RSUs as of June 30, 2026 and 2025 and their activity during the six months ended June 30, 2026 and 2025:
|  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Intrinsic Value |
|  | (In thousands) |  |  | (Per share data) |  |  | (In thousands) |
Balance as of December 31, 2024 |  |  | 13 |  |  | $ | 714.30 |  |  | $ | 132 |
Granted |  |  | 1,070 |  |  |  | 11.05 |  |  |  | — |
Released |  |  | (104 | ) |  |  | 28.08 |  |  |  | — |
Cancelled |  |  | (90 | ) |  |  | 30.91 |  |  |  | — |
Balance as of June 30, 2025 |  |  | 889 |  |  | $ | 16.51 |  |  | $ | 6,400 |
Expected to vest as of June 30, 2025 |  |  | 889 |  |  | $ | 16.51 |  |  | $ | 6,400 |
Balance as of December 31, 2025 |  |  | 1,030 |  |  | $ | 22.42 |  |  | $ | 14,158 |
Granted |  |  | 570 |  |  |  | 17.59 |  |  |  | — |
Released |  |  | (174 | ) |  |  | 25.35 |  |  |  | — |
Cancelled |  |  | (159 | ) |  |  | 39.59 |  |  |  | — |
Balance as of June 30, 2026 |  |  | 1,267 |  |  | $ | 17.96 |  |  | $ | 22,232 |
Expected to vest as of June 30, 2026 |  |  | 1,267 |  |  | $ | 17.96 |  |  | $ | 22,232 |
Schedule of Stock-Based Compensation Expense | The following sets forth the total stock-based compensation expense by type of award included in the statements of operations:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
|  | (In thousands) |  |  | (In thousands) |
Restricted stock units |  | $ | 2,428 |  |  | $ | 1,834 |  |  | $ | 4,316 |  |  | $ | 5,425 |
Stock options |  |  | 67 |  |  |  | 1 |  |  |  | 67 |  |  |  | 6 |
|  | $ | 2,495 |  |  | $ | 1,835 |  |  | $ | 4,383 |  |  | $ | 5,431 |
The following sets forth the total stock-based compensation expense included in cost of revenue and operating expenses on the statements of operations:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
|  | (In thousands) |  |  | (In thousands) |
Cost of 3D Printer and parts |  | $ | 86 |  |  | $ | 474 |  |  | $ | 558 |  |  | $ | 613 |
Cost of Support services |  |  | 19 |  |  |  | 125 |  |  |  | 189 |  |  |  | 194 |
Stock-based compensation recorded in cost of revenue |  |  | 105 |  |  |  | 599 |  |  |  | 747 |  |  |  | 807 |
Research and development |  |  | 917 |  |  |  | 356 |  |  |  | 1,457 |  |  |  | 783 |
Selling and marketing |  |  | 460 |  |  |  | 217 |  |  |  | 831 |  |  |  | 330 |
General and administrative |  |  | 1,013 |  |  |  | 663 |  |  |  | 1,348 |  |  |  | 3,511 |
Stock-based compensation recorded in operating expense |  |  | 2,390 |  |  |  | 1,236 |  |  |  | 3,636 |  |  |  | 4,624 |
Total stock-based compensation expense |  | $ | 2,495 |  |  | $ | 1,835 |  |  | $ | 4,383 |  |  | $ | 5,431 |

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