CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (6,134)	$ (15,434)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	6,736	6,424
Amortization of marketable securities premium		18
Stock-based compensation	2,344	2,718
Loss on disposal of equipment		18
Return of equity method investments as dividends	2,063	3,666
Equity in income of unconsolidated joint ventures	(2,495)	(2,344)
Deferred tax assets	(22)	122
Changes in operating assets and liabilities:
Accounts receivable	(8,526)	9,594
Inventories	1,134	(1,013)
Prepaid expenses and other current assets	(5,823)	1,909
Other assets	1,173	219
Accounts payable	3,043	(3,375)
Accrued liabilities	(1,387)	(1,742)
Other long-term liabilities	(5,488)	1,194
Net cash provided by (used in) operating activities	(13,382)	1,974
Cash flows from investing activities:
Purchases of property, plant and equipment	(5,604)	(11,178)
Proceeds from sales and maturities of available-for-sale debt securities	2,160	7,423
Proceeds from sales of equity securities - 15% Jia Mei		827
Investments in non-marketable equity investments	(560)	(1,918)
Net cash used in investing activities	(4,004)	(4,846)
Cash flows from financing activities:
Proceeds from common stock options exercised	28	10
Proceeds from short-term bank loans	41,582	42,197
Payments on short-term bank loans	(42,295)	(40,673)
Proceeds from capital increase in subsidiary shares from noncontrolling interests		708
Proceeds from long-term loan	5,831
Payments on long-term loan	(643)
Net cash provided by financing activities	4,503	2,242
Effect of exchange rate changes on cash and restricted cash	1,560	(1,418)
Net decrease in cash and restricted cash	(11,323)	(2,048)
Cash and restricted cash at the beginning of the year	50,114	41,348
Cash and restricted cash at the end of the period	38,791	39,300
Supplemental disclosure of non-cash flow information:
Notes receivables paid to purchase fixed assets	3,608
Investment in subsidiary shares from noncontrolling interest		308
Consideration payable in connection with construction in progress, included in accrued liabilities	$ 149	$ 3,315