CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (3,247)	$ (9,019)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,440	4,243
Amortization of marketable securities premium		14
Stock-based compensation	1,524	1,827
(Gain) loss on disposal of equipment		4
Return of equity method investments as dividends	2,063	3,666
Equity in income of unconsolidated joint ventures	(1,488)	(1,975)
Deferred tax assets	53	110
Changes in operating assets and liabilities:
Accounts receivable	(8,363)	8,741
Inventories	(1,045)	(1,223)
Prepaid expenses and other current assets	(1,317)	2,944
Other assets	89	(597)
Accounts payable	2,299	(5,192)
Accrued liabilities	(807)	(1,605)
Other long-term liabilities	(2,164)	828
Net cash provided by (used in) operating activities	(7,963)	2,766
Cash flows from investing activities:
Purchases of property, plant and equipment	(4,663)	(6,792)
Proceeds from sales and maturities of available-for-sale debt securities	480	2,903
Proceeds from sales of equity securities - 15% Jia Mei		827
Investments in non-marketable equity investments	(275)
Net cash used in investing activities	(4,458)	(3,062)
Cash flows from financing activities:
Proceeds from common stock options exercised	25	10
Proceeds from short-term bank loans	26,488	28,803
Payments on short-term bank loans	(28,332)	(27,653)
Proceeds from capital increase in subsidiary shares from noncontrolling interests		509
Proceeds from long-term loan	5,831
Payments on long-term loan	(333)
Net cash provided by financing activities	3,679	1,669
Effect of exchange rate changes on cash and restricted cash	225	(1,835)
Net decrease in cash and restricted cash	(8,517)	(462)
Cash and restricted cash at the beginning of the year	50,114	41,348
Cash and restricted cash at the end of the period	41,597	40,886
Supplemental disclosure of non-cash flow information:
Notes receivables paid to purchase fixed assets	2,545
Investment in subsidiary shares from noncontrolling interest		221
Consideration payable in connection with construction in progress, included in accrued liabilities	$ 144	$ 3,926