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Share-based payments - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 30, 2011
Dec. 31, 2013
Senior Executives [Member]
Dec. 31, 2012
Sales and Marketing Expense [Member]
Dec. 31, 2011
Sales and Marketing Expense [Member]
Dec. 31, 2013
General and Administrative Expense [Member]
Dec. 31, 2012
General and Administrative Expense [Member]
Dec. 31, 2011
General and Administrative Expense [Member]
Jan. 01, 2008
2008 Share Inventive Plan [Member]
Dec. 17, 2013
2008 Share Inventive Plan [Member]
Dec. 14, 2012
2008 Share Inventive Plan [Member]
Aug. 31, 2010
2008 Share Inventive Plan [Member]
Sep. 01, 2011
Employee Stock Option [Member]
Sep. 01, 2011
Employee Stock Option [Member]
Senior Executives [Member]
Feb. 08, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Four [Member]
Feb. 08, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Five [Member]
Feb. 13, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Six [Member]
Mar. 21, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Seven [Member]
Mar. 27, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Eight [Member]
Oct. 17, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Ten [Member]
Nov. 11, 2013
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Thirteen [Member]
Nov. 11, 2013
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Fourteen [Member]
Nov. 15, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Eleven [Member]
Mar. 04, 2013
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Twelve [Member]
May 23, 2012
Employee Stock Option [Member]
Senior Executives [Member]
Stock Option Nine [Member]
Dec. 17, 2013
Restricted Share [Member]
Nov. 11, 2013
Restricted Share [Member]
Dec. 31, 2013
Restricted Share [Member]
Dec. 31, 2012
Restricted Share [Member]
Dec. 31, 2011
Restricted Share [Member]
Dec. 31, 2013
Restricted Share [Member]
Senior Executives [Member]
Mar. 04, 2013
Restricted Share [Member]
Senior Executives [Member]
Nov. 15, 2012
Restricted Share [Member]
Senior Executives [Member]
Mar. 27, 2012
Restricted Share [Member]
Senior Executives [Member]
May 20, 2013
Restricted Share [Member]
Employee [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                                                                          
Share based compensation arrangement by share options 335,000 1,300,000 120,000               1,796,492         120,000 300,000 50,000 400,000 25,000 100,000 150,000 175,000 85,000 125,000 75,000 150,000                    
Increase in the number of authorized shares                       6,000,000 4,500,000 3,000,000                                              
Share based compensation arrangement, exercised prices     $ 0.01                         $ 1.74 $ 1.06 $ 1.06 $ 1.1 $ 1.55 $ 1.65 $ 1.57 $ 1.62 $ 1.62 $ 1.05   $ 1.69                    
Share based compensation arrangement, fair value options                             $ 123   $ 182 $ 35 $ 286 $ 22 $ 108 $ 150 $ 182 $ 78 $ 83 $ 48 $ 165                    
Share based compensation arrangement, vesting period         3 years                       1 year 3 years 3 years   3 years 3 years 3 years 1 year 3 years 3 years 3 years                    
Share based compensation arrangement, options cancelled                                         250,000                                
Share based compensation arrangement cancelled, exercised prices                                         $ 6.09                                
Share based compensation arrangement, exercised prices $ 1.49 $ 1.37 $ 1.74   $ 2.62                                         $ 1.02                      
Number of share options         225,000                                                                
Restricted stock units, vesting date         Jan. 04, 2010                                               Jan. 02, 2014                
Amount of compensation cost recognized   473 662     116 123 271 357 539                                                      
Unrecognized share-based compensation cost in respect of granted share options 348 359   308                                                                  
Restricted stock units, granted                                                       31,496 785,000       50,000 75,000 125,000 56,087 36,780
Restricted stock units, fair value                                                       $ 40 $ 1,272       $ 75 $ 77 $ 131 $ 93 $ 38
Restricted stock units, grant date                                                                       Jun. 27, 2013  
Restricted stock units vesting , period                                                                   3 years 3 years    
Restricted share units, compensation cost                                                           1,377 187 232          
Unrecognized share-based compensation cost in respect of granted restricted stock units                                                           48 0            
Percentage of transferred equity of SearchMedia International Limited   100.00%                                                                      
Option to acquire number of shares issued for transferred equity of SearchMedia International Limited   650,000                                                                      
Shares restricted Period   5 years                                                                      
Risk-free rate of return 2.63%                                                                        
Volatility rate 95.26%                                                                        
Expected life   5 years                                                                      
Dividend yield   0.00%                                                                      
Fair value of the share-based payment to nonemployees   $ 421