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	$ (3,479)	$ (7,377)
Adjustments to reconcile net loss to cash used in operating activities:
Depreciation expenses	162	182
Share-based compensation	389	1,029
Non-cash operating lease expenses	369	347
Unrealized gain on short-term investments	0	(22)
Gain on sale of subsidiary interests	(6,986)	0
Changes in assets and liabilities:
Short-term investments	254	(5,762)
Advances to suppliers	3	26
Prepaid expenses and other current assets	(102)	(109)
Other noncurrent assets	(30)	(77)
Accounts payable	(249)	711
Accrued expenses	915	(827)
Operating lease liabilities	(347)	(309)
Other current liabilities	(62)	35
Deferred revenue	(1,000)	0
Other noncurrent liabilities	91	(101)
Net cash used in operating activities	(10,072)	(12,254)
Cash flows from investing activities:
Acquisitions of property and equipment	(50)	0
Purchase of short-term investments	(5,000)	0
Proceeds from maturity of short-term investments	14,850	0
Proceeds from sale of subsidiary interests	7,354	0
Net cash provided by investing activities	17,154	0
Cash flows from financing activities:
Proceeds from issuance of ordinary shares	0	3,000
Net cash provided by financing activities	0	3,000
Effect of foreign exchange rate changes	(2)	(100)
Net increase (decrease) in cash and cash equivalents	7,080	(9,354)
Cash and cash equivalents from continuing operations at beginning of period	2,922	15,337
Cash and cash equivalents from discontinued operations at beginning of period	13,125	2,413
Less: cash and cash equivalents from discontinued operations at end of period	13,583	3,776
Cash and cash equivalents from continuing operations at end of period	9,544	4,620
Supplemental disclosures of cash flow information
Interest paid	0	0
Interest received	188	47
Income taxes paid	1	7
Non-cash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	39	0
Offering costs accrued in accrued expenses	$ 0	$ 30