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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities:    
Net loss $ 1,170 $ (3,288)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation expenses 80 67
Share-based compensation 244 251
Non-cash operating lease expenses 184 173
Unrealized gain on short-term investments 0 (4)
Gain on sale of subsidiary interests (6,986) 0
Changes in assets and liabilities:    
Short-term investments 254 (1,385)
Advances to suppliers (1) (28)
Prepaid expenses and other current assets (74) 65
Other noncurrent assets (12) (74)
Accounts payable 23 179
Accrued expenses 825 (1,288)
Operating lease liabilities (178) (152)
Other current liabilities 756 (199)
Deferred revenue (500) 500
Other noncurrent liabilities 17 (86)
Net cash used in operating activities (4,198) (5,269)
Cash flows from investing activities:    
Acquisitions of property and equipment (50) 0
Purchase of short-term investments (3,000) 0
Proceeds from maturity of short-term investments 2,000 0
Proceeds from sale of subsidiary interests 7,354 0
Net cash provided by investing activities 6,304 0
Effect of foreign exchange rate changes 5 (48)
Net increase (decrease) in cash and cash equivalents 2,111 (5,317)
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 11,631 9,151
Cash and cash equivalents from continuing operations at end of period 6,527 3,282
Supplemental disclosures of cash flow information    
Interest paid 0 0
Interest received 22 32
Non-cash activities:    
Operating lease right-of-use assets obtained in exchange for operating lease liabilities $ 39 $ 0