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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended 12 Months Ended 12 Months Ended
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