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Certain risks and concentration - Schedule of Consolidated Financial Information of VIEs and VIE's Subsidiaries - Balance sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current assets:        
Cash and cash equivalents $ 233,479 $ 199,504 $ 361,777 $ 404,275
Short-term investments 138,915 181,960    
Accounts receivable, net 40,632 14,536    
Due from related parties 6,986 1,097    
Deferred tax assets 1,221    
Inventories 3,879 374    
Prepayments and other current assets 6,866 13,593    
Total current assets 430,783 412,305    
Non-current assets:        
Deferred tax assets [1] 6,072 3,272    
Property and equipment, net 24,685 20,996    
Construction in progress 4,517 574    
Intangible assets, net 5,511 10,746    
Goodwill 21,760 20,497    
Other long-term prepayments 1,885 1,187    
Total assets 533,437 509,795    
Current liabilities:        
Accounts payable (note a) 49,819 33,376    
Due to a related party 10 45    
Deferred revenue and income, current portion 28,046 23,194    
Accrued liabilities and other payables (note b) 59,871 33,131    
Total current liabilities 141,696 93,405    
Non-current liabilities:        
Deferred revenue and income, non-current portion [2] 3,242 4,082    
Total liabilities 150,600 103,545    
Variable Interest Entity, Primary Beneficiary [Member]        
Current assets:        
Cash and cash equivalents 48,044 40,393    
Short-term investments 7,853 28,749    
Accounts receivable, net 40,938 14,824    
Due from related parties 6,970 1,083    
Deferred tax assets 0 971    
Inventories 3,880 374    
Prepayments and other current assets 10,963 15,123    
Held-for-sale assets 26 20    
Total current assets 118,674 101,537    
Non-current assets:        
Equity method investments 27,428 25,479    
Deferred tax assets 4,555 1,849    
Property and equipment, net 19,491 20,039    
Construction in progress 4,517 574    
Intangible assets, net 5,511 11,083    
Goodwill 21,760 20,497    
Other long-term prepayments 1,885 1,187    
Total non-current assets 85,147 80,708    
Total assets 203,821 182,245    
Current liabilities:        
Accounts payable (note a) [3] 68,469 44,162    
Due to a related party 10 45    
Deferred revenue and income, current portion 27,738 22,923    
Income tax payable 3,128 2,253    
Accrued liabilities and other payables (note b) [4] 132,322 104,114    
Held-for-sale liabilities 822 1,337    
Total current liabilities 232,489 174,834    
Non-current liabilities:        
Deferred revenue and income, non-current portion 2,934 3,539    
Total non-current liabilities 2,934 3,539    
Total liabilities $ 235,423 $ 178,373    
[1] As at December 31, 2017, the deferred tax asset and liability balances are expected to be recoverable as follows
[2] As of December 31, 2017, the non-current portion included membership subscription revenue of USD 425,000 (2016: USD 820,000), government grants of USD 2,509,000 (2016: USD 2,719,000), and reimbursement from the depositary of USD 308,000 (2016: USD 543,000).
[3] The balance included inter-companies balances with the Company and its subsidiaries of USD 9,360,000 and USD 18,704,000 as of December 31, 2016 and 2017, respectively.
[4] The balance included inter-companies balances with the Company and its subsidiaries of USD 91,477,000 and USD 74,394,000 as of December 31, 2016 and 2017, respectively.