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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.

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