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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |  |
Net income | $ 18,742 | $ 16,509 | $ 5,041
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 8,119 | 7,078 | 4,333
Amortization of marketable securities premium | 58 | 68 | 34
Stock-based compensation | 4,006 | 4,519 | 2,623
Provision for doubtful accounts | (177) | 87 | 183
(Gain) loss on disposal of equipment | (85) | (8) | 50
Return of equity method investments (dividends) | 1,608 | 774 |
Equity in income of unconsolidated joint ventures | (5,957) | (4,409) | (111)
Deferred tax assets | 104 | 2,340 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 4,535 | (9,748) | (5,333)
Inventories | (31,412) | (12,401) | (916)
Prepaid expenses and other current assets | (3,486) | (798) | (6,719)
Other assets | (471) | (6,283) | (104)
Accounts payable | (5,519) | 3,563 | 2,305
Accrued liabilities | (2,127) | (3,445) | 2,601
Other long-term liabilities, including royalties | 3,297 | (1,151) | 1,878
Net cash provided by (used in) operating activities | (8,765) | (3,305) | 5,865
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (28,465) | (29,645) | (19,855)
Purchases of available-for-sale debt securities | (2,158) | (9,645) | (5,968)
Proceeds from sales and maturities of available-for-sale debt securities | 5,400 | 480 | 9,401
Net cash used in investing activities | (25,223) | (38,810) | (16,422)
Cash flows from financing activities: |  |  |
Proceeds from common stock options exercised | 518 | 1,670 | 2,536
Proceeds from sale of subsidiary shares to noncontrolling interests |  | 538 | 396
Proceeds from bank loans | 53,078 | 20,543 | 10,401
Proceeds from long-term loan from noncontrolling interest |  | 1,834 |
Payments on bank loans | (17,798) | (19,066) | (5,996)
Proceeds from capital increase in subsidiary shares from noncontrolling interest | 2,233 |  |
Formation of new subsidiary with noncontrolling interests |  | 1,283 |
Proceeds from issuance of Tongmei's common stock to redeemable noncontrolling interests, net of costs |  | (1,077) | 47,563
Dividends paid by joint ventures to their minority shareholders |  |  | (2,238)
Net cash provided by financing activities | 38,031 | 5,725 | 52,662
Effect of exchange rate changes on cash and cash equivalents, and restricted cash | 542 | 551 | 3,605
Net increase (decrease) in cash and cash equivalents, and restricted cash | 4,585 | (35,839) | 45,710
Cash and cash equivalents at the beginning of the year | 36,763 | 72,602 | 26,892
Cash and cash equivalents, and restricted cash at the end of the period | 41,348 | 36,763 | 72,602
Supplemental disclosures: |  |  |
Income taxes paid, net of refunds | 1,692 | 3,177 | 1,959
Supplemental disclosure of non-cash flow information: |  |  |
Notes Receivables paid to purchase fixed assets | 6,835 |  |
Conversion of related party borrowings to Additional Paid-in Capital | 1,887 |  |
Investment in subsidiary shares from noncontrolling interest | 937 |  |
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities |  |  | 1,439
Reduction of noncontrolling interests in excess (deficit) of total consideration paid and payable in connection with the repurchase of subsidiary shares from noncontrolling interests |  |  | (1,398)
Bank loan proceeds paid directly to a third-party vendor, included in accounts payable | 474 |  |
Other receivable regarding sales of land and building to unconsolidated joint venture | 976 |  |
Consideration payable in connection with construction in progress, included in accrued liabilities | $ 4,135 | $ 2,974 | $ 1,457

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