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Deferred revenue and income - Schedule of Deferred Revenue and Income (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]    
Deferred revenue and income, Total $ 31,288,000 $ 27,276,000
Less: non-current portion [1] (3,242,000) (4,082,000)
Deferred revenue and income, current portion 28,046,000 23,194,000
Membership subscription revenues [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue and income, Total 26,303,000 22,115,000
Less: non-current portion (425,000) (820,000)
Online game revenues [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue and income, Total 174,000 152,000
Government grants [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue and income, Total [2] 3,811,000 4,195,000
Less: non-current portion (2,509,000) (2,719,000)
Reimbursement from the depository [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue and income, Total [3] 616,000 814,000
Less: non-current portion (308,000) (543,000)
Other Deferred Revenue [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue and income, Total [4] $ 384,000 $ 0
[1] 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).
[2] In June 2017, the Group received government grant of USD 1,224,000. This government grant was recognized as deferred income and amortized in 5 years under the property, plant and equipment depreciation policy.
[3] In December 2017, the Company received from its depositary bank a reimbursement of USD 127,000, net of withholding tax of USD 42,000. This reimbursement was recognized as deferred income and amortized over the depositary service period of 5 years.
[4] Others include live video revenues and issuance of LinkTokens.