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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Cash flows from operating activities: |  |  |
Net income | $ 38,755 | $ 24,501 | $ 5,913
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation of property, plant, and equipment | 4,481 | 3,608 | 3,060
Amortization of intangibles | 28 | 34 | 35
Accretion/amortization of investments available for sale | (1,198) |  |
Deferred income taxes | (1,344) | 1,495 | (849)
Change in net pension liability | 53 | 137 | 656
Loss on disposal of property and equipment | 65 | 2 | 213
Stock-based compensation expense | 20,371 | 14,605 | 12,146
Accretion of asset retirement obligation | 47 |  |
Provision for sales returns and bad debts | 913 | 318 | 835
Inventory provision | 2,423 | 1,654 | 1,706
Changes in working capital: |  |  |
Accounts receivable | (19,601) | (8,868) | (3,974)
Inventories | (7,943) | 66 | (1,390)
Prepayments, deposits, and other current assets | (2,549) | (711) | (3,753)
Accounts payable | 1,805 | 108 | (1,199)
Other current liabilities | (591) | 7,013 | 7,552
Net cash provided by operating activities | 35,715 | 43,962 | 20,951
Cash flows from investing activities: |  |  |
Acquisition of property and equipment | (18,108) | (13,645) | (8,404)
Purchase of investments available for sale | (155,748) |  |
Proceeds from sale or maturity of investments available for sale | 17,480 |  |
Net cash used in investing activities | (156,376) | (13,645) | (8,404)
Cash flows from financing activities: |  |  |
Repayment of finance lease obligations | (126) | (348) | (561)
Repayment of line of credit |  | 1,297 | 515
Proceeds from the exercise of stock options | 8,422 | 19,437 | 20,646
Proceeds from vested restricted stock | 1 | 1 | 1
Net cash provided by financing activities | 8,297 | 17,793 | 19,571
Effect of exchange rate changes on cash and cash equivalents | (862) | (857) | 367
Increase (decrease) in cash and cash equivalents | (113,226) | 47,253 | 32,485
Cash and cash equivalents, at beginning of year | 199,706 | 152,453 | 119,968
Cash and cash equivalents, at end of year | $ 86,480 | $ 199,706 | $ 152,453

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