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Unaudited Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | ATM Offering [Member] Common Stock [Member] | ATM Offering [Member] Additional Paid-in Capital [Member] | ATM Offering [Member] Retained Earnings [Member] | ATM Offering [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2023 |  |  |  |  | 14,118,000 |  |  |
Balance at Dec. 31, 2023 |  |  |  |  | $ 14 | $ 322,436 | $ (305,555) | $ 16,895
Issuance of common stock under ATM stock offering, net of stock issuance cost (in shares) |  |  |  |  | 223,000 |  |  |
Issuance of common stock under ATM stock offering, net of stock issuance cost |  |  |  |  | $ 0 | 3,535 | 0 | 3,535
Common stock issued under stock plans and employee stock purchase plans (in shares) |  |  |  |  | 81,000 |  |  |
Common stock issued under stock plans and employee stock purchase plans |  |  |  |  | $ 0 | 0 | 0 | 0
Stock-based compensation |  |  |  |  | 0 | 1,709 | 0 | 1,709
Net income (loss) |  |  |  |  | $ 0 | 0 | 108 | 108
Balance (in shares) at Mar. 31, 2024 |  |  |  |  | 14,422,000 |  |  |
Balance at Mar. 31, 2024 |  |  |  |  | $ 14 | 327,680 | (305,447) | 22,247
Balance (in shares) at Dec. 31, 2023 |  |  |  |  | 14,118,000 |  |  |
Balance at Dec. 31, 2023 |  |  |  |  | $ 14 | 322,436 | (305,555) | 16,895
Net income (loss) |  |  |  |  |  |  |  | (3,536)
Balance (in shares) at Sep. 29, 2024 |  |  |  |  | 14,697,000 |  |  |
Balance at Sep. 29, 2024 |  |  |  |  | $ 15 | 329,965 | (309,091) | 20,889
Balance (in shares) at Mar. 31, 2024 |  |  |  |  | 14,422,000 |  |  |
Balance at Mar. 31, 2024 |  |  |  |  | $ 14 | 327,680 | (305,447) | 22,247
Common stock issued under stock plans and employee stock purchase plans (in shares) |  |  |  |  | 36,000 |  |  |
Common stock issued under stock plans and employee stock purchase plans |  |  |  |  | $ 0 | 188 | 0 | 188
Stock-based compensation |  |  |  |  | 0 | 920 | 0 | 920
Net income (loss) |  |  |  |  | $ 0 | 0 | (1,550) | (1,550)
Balance (in shares) at Jun. 30, 2024 |  |  |  |  | 14,458,000 |  |  |
Balance at Jun. 30, 2024 |  |  |  |  | $ 14 | 328,788 | (306,997) | 21,805
Common stock issued under stock plans and employee stock purchase plans (in shares) |  |  |  |  | 239,000 |  |  |
Stock-based compensation |  |  |  |  | $ 0 | 1,177 | 0 | 1,177
Net income (loss) |  |  |  |  | 0 | 0 | (2,094) | (2,094)
Common stock issued under stock plans and employee stock purchase plan |  |  |  |  | $ 1 | 0 | 0 | 1
Balance (in shares) at Sep. 29, 2024 |  |  |  |  | 14,697,000 |  |  |
Balance at Sep. 29, 2024 |  |  |  |  | $ 15 | 329,965 | (309,091) | 20,889
Balance (in shares) at Dec. 29, 2024 |  |  |  |  | 15,336,000 |  |  |
Balance at Dec. 29, 2024 |  |  |  |  | $ 15 | 334,268 | (309,396) | 24,887
Issuance of common stock under ATM stock offering, net of stock issuance cost (in shares) | 182,000 |  |  |  | 256,000 |  |  |
Issuance of common stock under ATM stock offering, net of stock issuance cost | $ 0 | $ 1,199 | $ 0 | $ 1,199 | $ 1 | 1,499 | 0 | 1,500
Common stock issued under stock plans and employee stock purchase plans (in shares) |  |  |  |  | 50,000 |  |  |
Common stock issued under stock plans and employee stock purchase plans |  |  |  |  | $ 0 | 0 | 0 | 0
Stock-based compensation |  |  |  |  | 0 | 922 | 0 | 922
Net income (loss) |  |  |  |  | $ 0 | 0 | (2,191) | (2,191)
Balance (in shares) at Mar. 30, 2025 |  |  |  |  | 15,824,000 |  |  |
Balance at Mar. 30, 2025 |  |  |  |  | $ 16 | 337,888 | (311,587) | 26,317
Balance (in shares) at Dec. 29, 2024 |  |  |  |  | 15,336,000 |  |  |
Balance at Dec. 29, 2024 |  |  |  |  | $ 15 | 334,268 | (309,396) | 24,887
Issuance of common stock under ATM stock offering, net of stock issuance cost (in shares) |  |  |  | 713,228 |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | (8,868)
Balance (in shares) at Sep. 28, 2025 |  |  |  |  | 16,768,000 |  |  |
Balance at Sep. 28, 2025 |  |  |  |  | $ 17 | 342,977 | (318,264) | 24,730
Balance (in shares) at Mar. 30, 2025 |  |  |  |  | 15,824,000 |  |  |
Balance at Mar. 30, 2025 |  |  |  |  | $ 16 | 337,888 | (311,587) | 26,317
Issuance of common stock under ATM stock offering, net of stock issuance cost (in shares) | 496,000 |  |  |  |  |  |  |
Issuance of common stock under ATM stock offering, net of stock issuance cost | $ 0 | 2,948 | 0 | $ 2,948 |  |  |  |
Common stock issued under stock plans and employee stock purchase plans (in shares) |  |  |  |  | 58,000 |  |  |
Common stock issued under stock plans and employee stock purchase plans |  |  |  |  | $ 0 | 210 | 0 | 210
Stock-based compensation |  |  |  |  | 0 | 852 | 0 | 852
Net income (loss) |  |  |  |  | $ 0 | 0 | (2,670) | (2,670)
Balance (in shares) at Jun. 29, 2025 |  |  |  |  | 16,378,000 |  |  |
Balance at Jun. 29, 2025 |  |  |  |  | $ 16 | 341,898 | (314,257) | 27,657
Issuance of common stock under ATM stock offering, net of stock issuance cost (in shares) | 35,000 |  |  |  |  |  |  |
Issuance of common stock under ATM stock offering, net of stock issuance cost | $ 0 | $ 239 | $ 0 | $ 239 |  |  |  |
Common stock issued under stock plans and employee stock purchase plans (in shares) |  |  |  |  | 355,000 |  |  |
Stock-based compensation |  |  |  |  | $ 0 | 840 | 0 | 840
Net income (loss) |  |  |  |  | 0 | 0 | (4,007) | (4,007)
Common stock issued under stock plans and employee stock purchase plan |  |  |  |  | $ 1 | 0 | 0 | 1
Balance (in shares) at Sep. 28, 2025 |  |  |  |  | 16,768,000 |  |  |
Balance at Sep. 28, 2025 |  |  |  |  | $ 17 | $ 342,977 | $ (318,264) | $ 24,730

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