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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |  |
Net income (loss) | $ (11,791) | $ (19,193) | $ 18,742
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 8,979 | 8,722 | 8,119
Amortization of marketable securities premium |  | 18 | 58
Stock-based compensation | 3,097 | 3,540 | 4,006
Provision for credit losses |  | 272 | (177)
Loss on sale of equity investment |  | 166 |
(Gain) loss on disposal of equipment | 118 | 21 | (85)
Return of equity method investments as dividends | 2,396 | 4,316 | 1,608
Equity in income of unconsolidated joint ventures | (3,439) | (2,050) | (5,957)
Deferred tax assets | 265 | 553 | 104
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (6,896) | 9,306 | 4,535
Inventories | (737) | 1,073 | (31,412)
Prepaid expenses and other current assets | (6,002) | (652) | (3,486)
Other assets | 1,261 | 419 | (471)
Accounts payable | 3,038 | (162) | (5,519)
Accrued liabilities | 1,004 | (1,897) | (2,127)
Other long-term liabilities | (3,405) | (1,049) | 3,297
Net cash provided by (used in) operating activities | (12,112) | 3,403 | (8,765)
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (5,771) | (10,475) | (28,465)
Purchases of available-for-sale debt securities |  |  | (2,158)
Proceeds from sales and maturities of available-for-sale debt securities | 2,160 | 9,582 | 5,400
Proceeds from sales of equity securities - 15% Jia Mei |  | 827 |
Investments in non-marketable equity investments | (834) | (2,538) |
Net cash used in investing activities | (4,445) | (2,604) | (25,223)
Cash flows from financing activities: |  |  |
Proceeds from common stock options exercised | 28 | 10 | 518
Proceeds from short-term bank loans | 54,501 | 56,470 | 53,078
Payments on short-term bank loans | (60,092) | (49,210) | (17,798)
Proceeds from capital increase in subsidiary shares from noncontrolling interests |  | 708 | 2,233
Proceeds from long-term loan | 5,831 | 635 |
Payments on long-term loan | (804) |  |
Net cash provided by (used in) financing activities | (536) | 8,613 | 38,031
Effect of exchange rate changes on cash, restricted cash and cash equivalents | 790 | (646) | 542
Net increase (decrease) in cash, restricted cash and cash equivalents | (16,303) | 8,766 | 4,585
Cash, restricted cash and cash equivalents at the beginning of the year | 50,114 | 41,348 | 36,763
Cash, restricted cash and cash equivalents at the end of the period | 33,811 | 50,114 | 41,348
Supplemental disclosures: |  |  |
Income taxes paid, net of refunds | 962 | 686 | 1,692
Interest expense paid | 2,069 | 1,564 |
Supplemental disclosure of non-cash flow information: |  |  |
Loan proceeds received by notes receivable |  | 1,481 |
Notes receivables paid to purchase fixed assets | 4,572 | 4,170 | 6,835
Non-cash consideration received from sale of DongFang |  | 585 |
Conversion of related party borrowings to Additional Paid-in Capital |  |  | 1,887
Investment in subsidiary shares from noncontrolling interest |  | 308 | 937
Bank loan proceeds paid directly to a third-party vendor, included in accounts payable |  |  | 474
Sales of land and building to unconsolidated joint venture |  |  | 976
Consideration payable in connection with construction in progress, included in accrued liabilities | $ 857 | $ 6,574 | $ 4,135

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