Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net loss	$ (17,690)	$ (3,247)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,483	4,440
Stock-based compensation	1,279	1,524
Gain on disposal of equipment	(7)	0
Return of equity method investments as dividends	868	2,063
Gain from equity method and fair value investments	(77)	(1,488)
Deferred tax assets	(38)	53
Changes in operating assets and liabilities:
Accounts receivable	3,185	(8,363)
Inventories	6,219	(1,045)
Prepaid expenses and other current assets	5,334	(1,317)
Other assets	(2,941)	89
Accounts payable	(1,290)	2,299
Accrued liabilities	(2,265)	(807)
Other long-term liabilities	(4,982)	(2,164)
Net cash used in operating activities	(7,922)	(7,963)
Cash flows from investing activities:
Purchases of property, plant and equipment	(789)	(4,663)
Proceeds from sales and maturities of available-for-sale debt securities	0	480
Investments in non-marketable equity investments	(837)	(275)
Net cash used in investing activities	(1,626)	(4,458)
Cash flows from financing activities:
Proceeds from common stock options exercised	0	25
Proceeds from short-term bank loans	24,420	26,488
Payments on short-term bank loans	(20,158)	(28,332)
Proceeds from long-term loans	2,755	5,831
Payments on long-term loans	(456)	(333)
Net cash provided by financing activities	6,561	3,679
Effect of exchange rate changes on cash, restricted cash and cash equivalents	4,283	225
Net increase (decrease) in cash, restricted cash and cash equivalents	1,296	(8,517)
Cash, restricted cash and cash equivalents at the beginning of the year	33,811	50,114
Cash, restricted cash and cash equivalents at the end of the period	35,107	41,597
Supplemental disclosure of non-cash flow information:
Notes receivables paid to purchase fixed assets	1,510	2,545
Consideration payable in connection with construction in progress, included in accrued liabilities	$ 0	$ 144