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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities      
Net loss $ (19,853) $ (46,041) $ (63,415)
Adjustments to reconcile net loss to net cash generated from/(used in) operating activities      
Provision for bad debts 2,014 40 2,794
Impairment for inventory obsolescence 96 16 636
Impairment for long-term investment 80
Depreciation of property and equipment 839 2,022 2,174
Amortization of intangible assets 142 143 94
Gains on disposals of property and equipment (215) (94) (375)
Interest expenses 441 188 285
Amortization of beneficial conversion feature 149
Share-based compensation 3,098 8,757 50,607
Fair value (gains)/losses on other investments 12,958 12,363 (4,909)
Share of profit in equity method investments (72) (287)
Foreign currency exchange losses, net 2,519 1,106 182
Changes in operating assets and liabilities      
Accounts receivable 7,715 (8,239) 16,228
Prepayments and other assets 1,825 985 690
Inventories 2,413 (302) 4,036
Accrued expenses, accounts payable and other liabilities (9,647) 5,917 (9,273)
Amounts due to related parties 28 (50) 481
Amounts due from related parties 455 1,111 (1,572)
Contract liabilities (523) 686 (1,036)
Other non-current liabilities (58) (59) 335
Net cash (used in)/generated from operating activities 4,404 (21,738) (2,038)
Cash flows from investing activities      
Purchase of property and equipment (411) (787) (1,252)
Purchase of intangible assets (14) (92) (482)
Proceeds from disposal of property and equipment 266 193 230
Cash paid for equity method investment (247)
Cash paid for long-term investment (811)
Increase in short-term deposit (2) (3)
Purchase of other investments (3) (33,126)
Net cash used in investing activities (162) (935) (35,444)
Cash flows from financing activities      
Proceeds from other borrowings 212
Repayments of other borrowings (163) (1,819)
Proceeds from issuance of convertible bonds 4,735
Redemption of convertible bonds (1,050)
Proceeds from bank borrowings 9,496 11,419 3,674
Repayments of bank borrowings (9,452) (11,968) (5,074)
Proceeds from initial public offering, net of issuance costs 29,904
Proceeds from exercise of share options 1,284
Payments relating to current Lease Liability (238)
Net cash generated from financing activities 3,540 735 26,685
(Decrease)/increase in cash, cash equivalents and restricted cash 7,782 (21,938) (10,797)
Cash, cash equivalents and restricted cash at beginning of year 7,868 30,226 40,274
Effect of exchange rates on cash, cash equivalents and restricted cash (729) (420) 749
Cash, cash equivalents and restricted cash at end of year 14,921 7,868 30,226
Supplemental disclosure of cash flow information      
Interest paid (426) (188) (285)
Cash paid for amounts include in operating lease liabilities (15)
Supplemental disclosure on non-cash investing and financing activities:      
Accretion of Series A Preferred Shares $ (1,293)