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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Net loss for the year $ (14,140) $ (53,415) $ (39,490)
Adjustments to reconcile net loss to net cash generated from/(used in) operating activities      
Depreciation of property and equipment 9,277 5,824 5,595
Amortization of intangible assets 1,216 1,200 1,231
Amortization of the right-of-use assets 3,685 5,634  
Allowance for credit losses 1,137 19 7,680
Impairment/(recovery) of prepayments and other assets 4,168 (2,147) (1,516)
Loss/(gain) on disposal of property and equipment (55) 144 37
Share-based compensation 2,310 5,428 5,294
Share of loss from equity investees     307
Investment income on short-term investments (664) (1,708) (1,117)
Impairment of inventories 3,283 3,578 200
Impairment of long-term investments 794 19,831 7,794
Net unrealized gains on long-term investments (794) (10,907)  
Investment income on disposal of long-term investment (214) (579)  
Interest expense accrued on long-term payable 406 75 239
Deferred taxes 966 4,361 1,748
Deferred government grants (865) (1,735) (1,050)
Changes in operating assets and liabilities:      
Accounts receivable 5,048 (8,739) 13,256
Prepayments and other assets (1,263) 772 (2,000)
Due from/to related parties (8,598) (684) 11,457
Accounts payable (4,938) 2,086 (27,728)
Inventories 643 3,435 (10,178)
Contract liabilities 289 (664) 7,680
Income tax payable (163) 98 (390)
Accrued liabilities and other payables (11,707) (12,580) (14,657)
Lease liabilities (3,732) (4,976)  
Net cash used in operating activities (13,911) (45,649) (35,608)
Cash flows from investing activities      
Purchase of short-term investments (177,075) (355,294) (287,553)
Proceeds from disposal of short-term investments 167,439 450,687 223,738
Proceeds from disposal of property and equipment 721 576 442
Proceeds from disposal of long-term investments 1,076 528  
Purchase of intangible assets (59) (433) (2,121)
Acquisition of long-term investments   (2,838)  
Repayment of loans from employees 696 711 201
Acquisition of property and equipment (134) (3,084) (1,419)
Payment for constructions in progress (13,420) (11,593) (2,645)
Net cash (used in)/generated from investing activities (20,756) 79,260 (69,357)
Cash flows from financing activities      
Repurchase of shares (4,475)    
Governments grants received   853 732
Contribution by non-controlling     197
Proceeds from bank borrowings 7,816 11,324  
Repayment of loans due to a related party arising from a business combination (662)    
Net cash generated from financing activities 2,679 12,177 929
Net (decrease)/increase in cash, cash equivalents and restricted cash (31,988) 45,788 (104,036)
Cash, cash equivalents, and restricted cash at beginning of year 165,448 122,930 233,479
Effect of exchange rates on cash and cash equivalents, and restricted cash 5,329 (3,270) (6,513)
Cash, cash equivalents, and restricted cash at end of year 138,789 165,448 122,930
Supplemental disclosure of cash flow information      
Income tax paid (356) (142)  
Non cash investing and financing activities      
Acquisition of property and equipment in form of other payables (5,217) (321) $ (1,093)
Acquisition of right-of-use assets and lease liabilities, net off impact from lease modification $ (3,325) $ 2,723