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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |
Net income (loss) | $ 16,509,000 | $ 5,041,000 | $ (1,588,000)
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 7,078,000 | 4,333,000 | 5,531,000
Amortization of marketable securities premium | 68,000 | 34,000 | 37,000
Impairment charge on equity investee |  |  | 1,068,000
Stock-based compensation | 4,519,000 | 2,623,000 | 2,346,000
Provision for doubtful accounts |  | 183,000 |
Gain from deconsolidation of a subsidiary |  |  | (175,000)
(Gain) loss on disposal of equipment | (8,000) | 50,000 | 72,000
Return of equity method investments (dividends) | 774,000 |  | 362,000
Equity in (income) loss of unconsolidated joint ventures | (4,409,000) | (111,000) | 983,000
Deferred tax assets | 2,340,000 |  |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (9,661,000) | (5,333,000) | 441,000
Inventories | (12,401,000) | (916,000) | 8,862,000
Prepaid expenses and other current assets | (798,000) | (6,719,000) | 2,936,000
Other assets | (6,283,000) | (104,000) | (1,188,000)
Accounts payable | 3,563,000 | 2,305,000 | (3,137,000)
Accrued liabilities | (3,445,000) | 2,601,000 | (4,010,000)
Other long-term liabilities, including royalties | (1,151,000) | 1,878,000 | 118,000
Net cash provided by (used in) operating activities | (3,305,000) | 5,865,000 | 12,658,000
Cash flows from investing activities: |  |  |
Purchases of property, plant and equipment | (29,645,000) | (19,855,000) | (21,792,000)
Purchases of available-for-sale debt securities | (9,645,000) | (5,968,000) | (8,725,000)
Proceeds from sales and maturities of available-for-sale debt securities | 480,000 | 9,401,000 | 22,189,000
Net cash used in investing activities | (38,810,000) | (16,422,000) | (8,328,000)
Cash flows from financing activities: |  |  |
Proceeds from common stock options exercised | 1,670,000 | 2,536,000 | 268,000
Consideration paid to repurchase subsidiary shares from noncontrolling interests |  |  | (262,000)
Proceeds from bank loan | 20,543,000 | 10,401,000 | 5,814,000
Proceeds from short-term loan from noncontrolling interest | 1,834,000 |  |
Payments on bank loan | (19,066,000) | (5,996,000) |
Proceeds from sale of subsidiary shares to noncontrolling interests | 538,000 | 396,000 | 366,000
Formation of new subsidiary with noncontrolling interests | 1,283,000 |  |
Proceeds from issuance of Tongmei's common stock to redeemable noncontrolling interests, net of costs | (1,077,000) | 47,563,000 |
Dividends paid by joint ventures to their minority shareholders |  | (2,238,000) |
Net cash provided by financing activities | 5,725,000 | 52,662,000 | 6,186,000
Effect of exchange rate changes on cash and cash equivalents | 551,000 | 3,605,000 | (150,000)
Net increase (decrease) in cash and cash equivalents | (35,839,000) | 45,710,000 | 10,366,000
Cash and cash equivalents at the beginning of the year | 72,602,000 | 26,892,000 | 16,526,000
Cash and cash equivalents at the end of the period | 36,763,000 | 72,602,000 | 26,892,000
Supplemental disclosures: |  |  |
Income taxes paid, net of refunds | 3,177,000 | 1,959,000 | 749,000
Supplemental disclosure of non-cash flow information: |  |  |
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities |  | 1,439,000 | 151,000
Reduction of noncontrolling interests in excess (deficit) of total consideration paid and payable in connection with the repurchase of subsidiary shares from noncontrolling interests |  | (1,398,000) | (74,000)
Consideration payable in connection with construction in progress, included in accrued liabilities | $ 2,974,000 | $ 1,457,000 | $ 1,447,000

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