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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ (9,019) $ 10,517
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 4,243 3,995
Amortization of marketable securities premium 14 39
Stock-based compensation 1,827 2,225
Loss on disposal of equipment 4 58
Return of equity method investments (dividends) 3,666  
Equity in income of unconsolidated joint ventures (1,975) (3,302)
Deferred tax assets 110 61
Changes in operating assets and liabilities:    
Accounts receivable 8,741 (4,938)
Inventories (1,223) (15,589)
Prepaid expenses and other current assets 2,944 4,821
Other assets (597) (746)
Accounts payable (5,192) 8,823
Accrued liabilities (1,605) (2,677)
Other long-term liabilities 828 2,250
Net cash provided by operating activities 2,766 5,537
Cash flows from investing activities:    
Purchases of property, plant and equipment (6,792) (20,854)
Proceeds from sales and maturities of available-for-sale debt securities 2,903 2,480
Proceeds from sales of equity securities - 15% Jia Mei 827  
Net cash used in investing activities (3,062) (18,374)
Cash flows from financing activities:    
Proceeds from common stock options exercised 10 146
Proceeds from bank loans 28,803 23,380
Payments on bank loans (27,653) (2,799)
Proceeds from capital increase in subsidiary shares from noncontrolling interests 509 1,313
Net cash provided by financing activities 1,669 22,040
Effect of exchange rate changes on cash and cash equivalents, and restricted cash (1,835) (1,023)
Net increase (decrease) in cash and cash equivalents, and restricted cash (462) 8,180
Cash and cash equivalents, and restricted cash at the beginning of the year 41,348 36,763
Cash and cash equivalents, and restricted cash at the end of the period 40,886 44,943
Supplemental disclosure of non-cash flow information:    
Conversion of related party borrowings to Additional Paid-in Capital   1,887
Investment in subsidiary shares from noncontrolling interest 221 678
Bank loan proceeds paid directly to a third-party vendor, included in accounts payable   1,177
Consideration payable in connection with construction in progress, included in accrued liabilities $ 3,926 $ 587