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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Dec. 30, 2023
Cash flows from operating activities:      
Net income $ 21,781 $ 1,342  
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 7,193 7,576  
Amortization 640 2,378  
Reduction in the carrying amount of right-of-use assets 1,415 1,690  
Stock-based compensation expense 10,405 9,290  
Deferred income tax benefit (1,293) (145)  
Provision for excess and obsolete inventories 3,146 4,973  
Gain (Loss) on Disposition of Business (20,271) 0  
Other adjustments to reconcile net income to net cash provided by operating activities 176 278  
Changes in assets and liabilities:      
Accounts receivable 6,466 (15,926)  
Inventories (4,926) 1,375  
Prepaid expenses and other current assets 1,224 1,009  
Other assets 17 (55)  
Accounts payable 4,948 (1,819)  
Accrued liabilities (1,963) (10,209)  
Other liabilities 1,085 319  
Deferred revenues 4,499 (6,046)  
Deferred grant 0   $ 18,000
Operating lease liabilities (1,530) (1,721)  
Net cash provided by operating activities 33,012 12,309  
Cash flows from investing activities:      
Acquisition of property, plant and equipment (13,436) (19,701)  
Proceeds from sale of business 21,275 0  
Purchases of marketable securities (37,472) (27,311)  
Proceeds from maturities and sales of marketable securities 25,813 33,473  
Net cash used in investing activities (3,820) (13,539)  
Cash flows from financing activities:      
Proceeds from issuances of common stock 4,948 5,024  
Purchase of common stock through stock repurchase program (17,334) 0  
Tax withholdings related to net share settlements of equity awards (1,840) (387)  
Payments on term loan (266) (259)  
Net cash provided by (used in) financing activities (14,492) 4,378  
Effect of exchange rate changes on cash, cash equivalents and restricted cash (1,592) (276)  
Net increase in cash, cash equivalents and restricted cash 13,108 2,872  
Cash, cash equivalents and restricted cash, beginning of period 181,273 112,982 112,982
Cash, cash equivalents and restricted cash, end of period 194,381 115,854 181,273
Non-cash investing and financing activities:      
Decrease in accounts payable and accrued liabilities related to property, plant and equipment purchases 2,567 3,755  
Operating lease, right-of-use assets obtained in exchange for lease obligations 0 727  
Supplemental disclosure of cash flow information:      
Cash paid for income taxes, net 1,423 7,391  
Cash paid for interest 100 106  
Operating cash outflows from operating leases 2,305 2,191  
Reconciliation of cash, cash equivalents and restricted cash:      
Cash and cash equivalents 186,296 112,360 177,812
Restricted cash, current 5,865 1,207  
Restricted cash, non-current 2,220 2,287  
Total cash, cash equivalents and restricted cash $ 194,381 $ 115,854 $ 181,273