CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (2,048)	$ (3,666)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,192	2,118
Amortization of marketable securities premium		7
Stock-based compensation	809	915
(Gain) Loss on disposal of equipment		5
Equity in income of unconsolidated joint ventures	(890)	(1,034)
Deferred tax assets	40	(10)
Changes in operating assets and liabilities:
Accounts receivable	(6,076)	7,982
Inventories	(720)	(1,466)
Prepaid expenses and other current assets	(375)	1,965
Other assets	65	(1,055)
Accounts payable	815	(3,351)
Accrued liabilities	(558)	(1,568)
Other long-term liabilities	(2,060)	(2,376)
Net cash used in operating activities	(8,806)	(1,534)
Cash flows from investing activities:
Purchases of property, plant and equipment	(4,392)	(3,616)
Proceeds from sales and maturities of available-for-sale debt securities	480	2,903
Net cash used in investing activities	(3,912)	(713)
Cash flows from financing activities:
Proceeds from common stock options exercised	20	8
Proceeds from short-term bank loans	12,858	18,372
Payments on short-term bank loans	(16,541)	(12,810)
Proceeds from capital increase in subsidiary shares from noncontrolling interests		203
Proceeds from long-term loan	5,831
Payments on long-term loan	(168)
Net cash provided by financing activities	2,000	5,773
Effect of exchange rate changes on cash and restricted cash	204	19
Net increase (decrease) in cash and restricted cash	(10,514)	3,545
Cash and restricted cash at the beginning of the year	50,114	41,348
Cash and restricted cash at the end of the period	39,600	44,893
Supplemental disclosure of non-cash flow information:
Notes receivables paid to purchase fixed assets	1,377
Investment in subsidiary shares from noncontrolling interest		$ 72
Consideration payable in connection with construction in progress, included in accrued liabilities	$ 21