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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities      
Net loss for the year $ (53,415) $ (39,490) $ (37,809)
Adjustments to reconcile net loss to net cash generated from/(used in) operating activities      
Depreciation of property and equipment 5,824 5,595 7,948
Amortization of intangible assets 1,200 1,231 2,101
Amortization of the right-of-use assets 5,634    
Allowance for doubtful accounts 19 7,680 27
Impairment/(recovery) of receivables from and prepayments to Kankan (2,147) (1,516) 8,723
Loss on disposal of property and equipment 144 37 85
Share-based compensation 5,428 5,294 8,330
Share of loss from equity investees 0 307 1,875
Investment income on short-term investments (1,708) (1,117) (728)
Impairment of property and equipment   0 20
Impairment of inventories 3,578 200  
Impairment of intangible assets     4,833
Impairment of long-term investments 19,831 7,794 596
Net unrealized gains on long-term investments (10,907)   (491)
Investment income on disposal of long-term investment (579)    
Interest expense accrued on long-term payable 75 239 239
Deferred taxes 4,361 1,748 (2,214)
Deferred government grants (1,735) (1,050) (3,493)
Changes in operating assets and liabilities:      
Accounts receivable (8,739) 13,256 (20,040)
Prepayments and other assets 772 (2,000) (11,418)
Due from/to related parties (684) 11,457 (4,879)
Accounts payable 2,086 (27,728) 9,037
Inventories 3,435 (10,178) (2,925)
Contract liabilities (664) 7,680 (510)
Income tax payable 98 (390) 339
Accrued liabilities and other payables (12,580) (14,657) 26,138
Lease liabilities (4,976)    
Net cash used in operating activities (45,649) (35,608) (14,216)
Cash flows from investing activities      
Purchase of short-term investments (355,294) (287,553) (244,781)
Proceeds from disposal of short-term investments 450,687 223,738 291,568
Proceeds from disposal of property and equipment 576 442 23
Proceeds from disposal of long-term investments 528   191
Purchase of intangible assets (433) (2,121) (481)
Acquisition of long-term investments (2,838)   (2,793)
Repayment of loans from employees 711 201 423
Acquisition of property and equipment (3,084) (1,419) (5,318)
Payment for constructions in progress (11,593) (2,645) (3,624)
Net cash generated from/(used in) investing activities 79,260 (69,357) 35,208
Cash flows from financing activities      
Repurchase of shares     (358)
Governments grants received 853 732 2,908
Proceeds from exercise of vested share options     11
Contribution by non-controlling   197  
Proceeds from bank borrowings 11,324    
Net cash generated from financing activities 12,177 929 2,561
Net increase/(decrease) in cash, cash equivalents and restricted cash 45,788 (104,036) 23,553
Cash, cash equivalents and restricted cash at beginning of year 122,930 233,479 199,504
Effect of exchange rates on cash and cash equivalents, and restricted cash (3,270) (6,513) 10,422
Cash, cash equivalents, and restricted cash at end of year 165,448 122,930 233,479
Supplemental disclosure of cash flow information      
Income tax paid (142)    
Non cash investing and financing activities      
Acquisition of property and equipment in form of other payables $ (321) $ (1,093) $ (2,774)