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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Treasury stock [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Interest on withheld tax price 5.00%      
Aiden & Jasmine Limited [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Withholding Tax Payable Non-current [1]   $ 54 $ 54 $ 54
Aiden & Jasmine Limited [Member] | Treasury stock [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Shares repurchased 3,860,733      
Shares repurchased, value $ 10,879,000      
Interest on withheld tax 37,000      
Withholding Tax Payable Non-current $ 1,125,000 54,000    
Vantage Point Global Limited [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Withholding Tax Payable Non-current [1]   146 $ 146 $ 146
Vantage Point Global Limited [Member] | Treasury stock [Member]        
Schedule of Other Related Party Transactions [Line Items]        
Shares repurchased 10,334,679      
Shares repurchased, value $ 29,121,000      
Interest on withheld tax 100,000      
Withholding Tax Payable Non-current $ 3,012,000 $ 146,000    
[1] In 2014, the Group repurchased 3,860,733 common shares from Aiden & Jasmine Limited (Co founder’s company) for USD10,879,000 and 10,334,679 common shares from Vantage Point Global Limited (Founder’s company) for USD29,121,000. According to the repurchase contract, the Company was entitled to an amount (the “Withheld Price”) to withhold any taxes with respect to this repurchase as required under the applicable laws. If the Sellers (Aiden & Jasmine Limited and Vantage Point Global Limited) have not been specifically required by the applicable governmental or regulatory authority to pay any taxes as required under the applicable laws in connection with the repurchase, after the fifth anniversary of the Closing Date, the Company will pay to the Sellers the Withheld Price with a simple interest thereon at the rate of five percent (5%) per annum (the “repayment price”) from the Closing Date. Therefore, the Withheld Price for Aiden & Jasmine Limited and Vantage Point Global Limited was USD 1,125,000 (including interest of USD 37,000) and USD 3,012,000 (including interest of USD 100,000) respectively. The interest accrued in 2017 was USD 54,000 and 146,000 for Aiden & Jasmine Limited and Vantage Point Global Limited respectively.