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Balance Sheet Information (Tables) | 6 Months Ended
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Jun. 28, 2026
Balance Sheet Information [Abstract] |
Schedule of Allowance for Credit Loss on Accounts Receivable |
| Three-Month Period Ended |  | Six-Month Period Ended
Allowance for credit losses - Accounts Receivable | June 28, 2026 |  | June 29, 2025 |  | June 28, 2026 |  | June 29, 2025
Balance at beginning of period | $ | 80 |  |  | $ | 597 |  |  | $ | 80 |  |  | $ | 398 |
Provision for credit losses | — |  |  | (9) |  |  | — |  |  | 346 |
Accounts written off | (64) |  |  | (491) |  |  | (64) |  |  | (619) |
Less recoveries of accounts charged off | — |  |  | 28 |  |  | — |  |  | — |
Balance at end of period | $ | 16 |  |  | $ | 125 |  |  | $ | 16 |  |  | $ | 125 |
Schedule of Inventory |
Inventory | June 28, 2026 |  | December 28, 2025
Raw materials | $ | 1,481 |  |  | $ | 2,064 |
Work-in-process | 83 |  |  | — |
Supplies and spare parts | 24,668 |  |  | 22,536 |
Total inventory, current | 26,232 |  |  | 24,600 |
Inventory, non-current (1) | 10,300 |  |  | 9,370 |
Total inventory | $ | 36,532 |  |  | $ | 33,970 |
(1)Inventory, non-current consists of spare parts that will not be used within twelve months. Inventory non-current is included in Other assets on the consolidated balance sheet.
Schedule of Prepaid Expenses and Other Current Assets |
Prepaid expenses and other current assets | June 28, 2026 |  | December 28, 2025
Prepaid expenses | $ | 6,186 |  |  | $ | 5,307 |
Tools purchased for customers (1) | 7,452 |  |  | 20,503 |
Deferred contract costs | 2,203 |  |  | 1,459 |
Investment tax credit receivable - current | 1,624 |  |  | — |
Total prepaid assets and other current assets | $ | 17,465 |  |  | $ | 27,269 |
(1)The Company acquires tools for its customers that consist of manufacturing equipment its customers will own but will be installed and qualified in a SkyWater facility. Prior to the customer obtaining ownership and control of the equipment, the Company records the costs associated with the acquisition, installation, and qualification of the equipment within prepaid expenses and other current assets. These deferred costs are recognized as cost of revenue when control of the equipment transfers to the customer and the related tools revenue is recognized.
Schedule of Property and Equipment, Net |
Property and equipment, net | June 28, 2026 |  | December 28, 2025
Land | $ | 36,596 |  |  | $ | 36,596 |
Buildings and improvements | 163,789 |  |  | 164,752 |
Machinery and equipment (2) | 479,824 |  |  | 456,090 |
Property and equipment placed in service, at cost (1) | 680,209 |  |  | 657,438 |
Less: accumulated depreciation (1) | (204,833) |  |  | (181,737) |
Property and equipment placed in service, net (1) | 475,376 |  |  | 475,701 |
Property and equipment not yet in service | 22,708 |  |  | 36,019 |
Total property and equipment, net | $ | 498,084 |  |  | $ | 511,720 |
(1)Includes $28,683 and $29,651 of cost and $3,895 and $3,974 of accumulated depreciation associated with capital assets subject to financing leases at June 28, 2026 and December 28, 2025, respectively. (2)The cost basis of machinery and equipment reflects the amount of investment tax credits the Company has received, or expects to receive, on new investments in related equipment.
Schedule of Intangible Assets |
Intangible Assets, net | June 28, 2026 |  | December 28, 2025
Software and licensed technology | $ | 20,163 |  |  | $ | 18,758 |
Less: accumulated amortization | (10,119) |  |  | (13,460) |
Intangible assets placed in service, net | 10,044 |  |  | 5,298 |
Intangible assets not yet in service | 3,627 |  |  | 3,870 |
Total intangible assets, net | $ | 13,671 |  |  | $ | 9,168 |
Schedule of Remaining Estimated Aggregate Annual Amortization Expense | Remaining estimated aggregate annual amortization expense for intangible assets placed in service is as follows for future fiscal years:
Fiscal year |  | Amortization Expense
Remainder of 2026 |  | $ | 1,112 |
2027 |  | 1,805 |
2028 |  | 1,813 |
2029 |  | 1,595 |
2030 |  | 1,562 |
Thereafter |  | 2,157 |
Total |  | $ | 10,044 |
Schedule of Other Assets |
Other Assets | June 28, 2026 |  | December 28, 2025
Inventory, non-current (1) | $ | 10,300 |  |  | $ | 9,370 |
Operating lease right-of-use assets | 262 |  |  | — |
Investment tax credit receivable - non-current | 19,349 |  |  | 10,230 |
Other assets | 1,085 |  |  | 223 |
Total other assets | $ | 30,996 |  |  | $ | 19,823 |
(1)Inventory, non-current consists of spare parts that will not be used within twelve months.
Schedule of Accrued Expenses |
Accrued Expenses | June 28, 2026 |  | December 28, 2025
Accrued compensation | $ | 25,675 |  |  | $ | 11,248 |
Accrued commissions | 320 |  |  | 390 |
Accrued royalties | 477 |  |  | 1,815 |
Current portion of operating lease liabilities | 37 |  |  | — |
Current portion of finance lease liabilities | 2,280 |  |  | 2,203 |
Accrued inventory (2) | 7,422 |  |  | 2,233 |
Accrued warranty | 536 |  |  | 1,131 |
Accrued vendor purchase commitments (1) | 10,318 |  |  | 14,094 |
Accrued accounts payable | 11,953 |  |  | 15,041 |
Accrued utilities | 1,296 |  |  | 1,208 |
Other accrued expenses | 4,129 |  |  | 7,249 |
Total accrued expenses | $ | 64,443 |  |  | $ | 56,612 |
(1)The Company accrues outstanding obligations on vendor purchase orders for goods or services provided to the Company for which invoices have not yet been received. (2)The Company accrues outstanding obligations on uninvoiced receipts of inventory and inventory in transit.
| Three-Month Period Ended |  | Six-Month Period Ended
Accrued provisions for warranties | June 28, 2026 |  | June 29, 2025 |  | June 28, 2026 |  | June 29, 2025
Beginning accrued warranty balance | $ | 998 |  |  | $ | 2,687 |  |  | $ | 1,131 |  |  | $ | 3,752 |
Warranty expense | 462 |  | 582 |  | 594 |  | 821
Warranty credits | (924) |  |  | (1,130) |  |  | (1,189) |  |  | (2,434) |
Ending accrued warranty balance | $ | 536 |  |  | $ | 2,139 |  |  | $ | 536 |  |  | $ | 2,139 |
Schedule of Other Noncurrent Liabilities |
Other long-term liabilities | June 28, 2026 |  | December 28, 2025
Finance lease obligations | $ | 25,916 |  |  | $ | 24,859 |
Other | 968 |  |  | 369 |
Liability for uncertain tax positions | 69 |  |  | 69 |
Total other long-term liabilities | $ | 26,953 |  |  | $ | 25,297 |

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