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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities      
Net (loss)/income for the year $ 1,108 $ (14,140) $ (53,415)
Adjustments to reconcile net (loss)/income to net cash (used in)/generated from operating activities      
Depreciation of property and equipment 6,319 9,277 5,824
Amortization of intangible assets 1,129 1,216 1,200
Amortization of the right-of-use assets (1,934) (3,685) (5,634)
Allowance for doubtful accounts 1,213 5,305 (2,128)
Loss/(gain) on disposal of property and equipment 31 (55) 144
Share-based compensation 6,170 2,310 5,428
Investment income from short-term investments (404) (664) (1,708)
Impairment of inventories 429 3,283 3,578
Impairment of long-term investments   794 19,831
Net unrealized gains on long-term investments   (794) (10,907)
Investment income on disposal of long-term investments (42) (214) (579)
Interest expense accrued on due to related parties 95 406 75
Deferred taxes (178) 966 4,361
Deferred government grants (169) (865) (1,735)
Changes in operating assets and liabilities:      
Accounts receivable (2,168) 5,048 (8,739)
Prepayments and other assets (2,319) (1,263) 772
Due from/to related parties (8,507) (8,598) (684)
Accounts payable 5,238 (4,938) 2,086
Inventories (36) 643 3,435
Contract liabilities 2,112 289 (664)
Income tax payable (77) (163) 98
Accrued liabilities and other payables 9,605 (11,707) (12,580)
Lease liabilities (2,003) (3,732) (4,976)
Net cash (used in)/generated from operating activities 19,480 (13,911) (45,649)
Cash flows from investing activities      
Purchase of short-term investments (337,738) (177,075) (355,294)
Proceeds from collection upon maturities of short-term investments 341,960 167,439 450,687
Proceeds from disposal of property and equipment 207 721 576
Proceeds from disposal of long-term investments 42 1,076 528
Purchase of intangible assets (84) (59) (433)
Acquisition of long-term investments (3,627)   (2,838)
Repayment/(payment) of loans to employees   696 711
Repayment/(payment) of loans to employees (177)    
Acquisition of property and equipment (5,821) (134) (3,084)
Loan to a related party (20,000)    
Payment for construction in progress (7,381) (13,420) (11,593)
Net cash generated from/(used in) investing activities (32,619) (20,756) 79,260
Cash flows from financing activities      
Repurchase of shares   (4,475)  
Governments grants received     853
Proceeds from bank borrowings 2,196 7,816 11,324
Repayment of bank borrowings (2,419)    
Repayment of loans due to a related party arising from a business combination   (662)  
Net cash generated from/(used in) financing activities (223) 2,679 12,177
Net increase/(decrease) in cash, cash equivalents and restricted cash (13,362) (31,988) 45,788
Effect of exchange rates on cash and cash equivalents, and restricted cash 2,009 5,329 (3,270)
Cash and cash equivalents at beginning of year 137,248 162,465 122,930
Restricted cash at beginning of year 1,541 2,983  
Cash, cash equivalents and restricted cash at beginning of year 138,789 165,448 122,930
Cash and cash equivalents at end of year 123,358 137,248 162,465
Restricted cash at end of year 4,078 1,541 2,983
Cash, cash equivalents and restricted cash at end of year 127,436 138,789 165,448
Supplemental disclosure of cash flow information      
Income tax paid (66) (356) (142)
Non-cash investing and financing activities      
-Acquisition of property and equipment in form of other payables (568) (5,217) (321)
-Acquisition of right-of-use assets and lease liabilities, net off impact from lease modification $ (10) $ (3,325) $ 2,723