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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 USD ($) Segment Unit | Dec. 31, 2013 CNY | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Feb. 25, 2013 CNY | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Peoples' Republic of China [Member] USD ($) | Dec. 31, 2012 Peoples' Republic of China [Member] USD ($) | Dec. 31, 2013 United States and Hong Kong [Member] HKD | Dec. 31, 2012 United States and Hong Kong [Member] USD ($) | Dec. 31, 2013 Accounts Receivable [Member] Customer | Dec. 31, 2013 Accounts Receivable [Member] Customer One [Member] | Dec. 31, 2012 Accounts Receivable [Member] Customer One [Member] | Dec. 31, 2013 Accounts Receivable [Member] Customer Two [Member] | Dec. 31, 2012 Accounts Receivable [Member] Customer Two [Member] | Dec. 31, 2013 Accounts Receivable [Member] Customer Three [Member] | Dec. 31, 2012 Accounts Receivable [Member] Customer Three [Member] | Dec. 31, 2013 Accounts Receivable [Member] Customer Four [Member] | Dec. 31, 2012 Accounts Receivable [Member] Customer Four [Member] | Dec. 31, 2013 Sales [Member] Customer | Dec. 31, 2013 Sales [Member] Customer One [Member] | Dec. 31, 2012 Sales [Member] Customer One [Member] | Dec. 31, 2011 Sales [Member] Customer One [Member] | Dec. 31, 2013 Sales [Member] Customer Two [Member] | Dec. 31, 2012 Sales [Member] Customer Two [Member] | Dec. 31, 2011 Sales [Member] Customer Two [Member] | Dec. 31, 2013 Sales [Member] Customer Three [Member] | Dec. 31, 2012 Sales [Member] Customer Three [Member] | Dec. 31, 2011 Sales [Member] Customer Three [Member] | Dec. 31, 2013 Sales [Member] Customer Four [Member] | Dec. 31, 2012 Sales [Member] Customer Four [Member] | Dec. 31, 2011 Sales [Member] Customer Four [Member] | Dec. 31, 2013 Sales [Member] Customers Outside China [Member] Maximum [Member] | Dec. 31, 2012 Sales [Member] Customers Outside China [Member] Maximum [Member] | Dec. 31, 2011 Sales [Member] Customers Outside China [Member] Maximum [Member] | Dec. 31, 2013 Property, Plant and Equipment [Member] Supplier Concentration Risk [Member] Supplier | Dec. 31, 2011 Property, Plant and Equipment [Member] Supplier Concentration Risk [Member] Supplier | Dec. 31, 2012 Property, Plant and Equipment [Member] Maximum [Member] Supplier Concentration Risk [Member] Supplier
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and bank deposits |  |  |  |  |  |  |  | $ 83,000 | $ 2,009,000 | 5,522,000 | $ 5,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unit USD-denominated UBS Jersey Call Certificate | 50 | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD-denominated UBS Jersey Call Certificate, Fair value |  |  | 2,530,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
USD-denominated UBS Jersey Call Certificate, par value | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product redemption period | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product redemption, lower range | 2.15% | 2.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product redemption, upper range | 3.55% | 3.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product redemption amount |  |  |  |  | 2,025,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Floating yield |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FDIC Insurance limit | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets | 6 years | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising service revenue on a straight-line basis |  |  |  |  |  | 3 days | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising and promotion costs | $ 111,000 |  | $ 3,573,000 | $ 3,852,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to PRC employee | 22.00% | 22.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contribution to the scheme | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized income tax positions | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk |  |  |  |  |  |  |  |  |  |  |  |  | 34.00% | 0.00% | 24.00% | 0.00% | 13.00% | 0.00% | 10.00% | 0.00% |  | 22.00% | 0.00% | 0.00% | 17.00% | 0.00% | 0.00% | 15.00% | 0.00% | 0.00% | 15.00% | 0.00% | 0.00% | 10.00% | 10.00% | 10.00% | 13.00% | 10.00% | 10.00%
Number of operating Segment | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major customer |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of major suppliers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 0 | 0

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