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Common shares and warrants - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Nov. 30, 2012
Nov. 15, 2012
Aug. 17, 2012
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2012
Zhejiang Continental [Member]
Dec. 31, 2011
Zhejiang Continental [Member]
Dec. 31, 2012
HK Ad-Icon [Member]
Dec. 31, 2011
HK Ad-Icon [Member]
Dec. 31, 2011
Wuxi Ruizhong [Member]
Jan. 31, 2010
Warrant [Member]
Oct. 30, 2009
Warrant [Member]
Dec. 31, 2012
Warrant [Member]
Dec. 31, 2011
Warrant [Member]
Dec. 31, 2010
Warrant [Member]
Oct. 30, 2009
Warrant [Member]
SearchMedia International shareholders [Member]
Dec. 31, 2012
Warrant [Member]
SearchMedia International shareholders [Member]
Dec. 31, 2012
Settlement Agreement [Member]
Sep. 19, 2012
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2010
Common Stock [Member]
Aug. 17, 2012
Common Stock [Member]
May 02, 2012
Common Stock [Member]
Zhejiang Continental [Member]
Aug. 29, 2012
Common Stock [Member]
HK Ad-Icon [Member]
Dec. 31, 2012
Common Stock [Member]
Wuxi Ruizhong [Member]
Aug. 17, 2012
Common Stock Purchase Agreement [Member]
Dec. 31, 2012
Revised Date [Member]
Dec. 31, 2012
Minimum [Member]
Warrant [Member]
Dec. 31, 2012
Minimum [Member]
Warrant [Member]
SearchMedia International shareholders [Member]
Dec. 31, 2012
Maximum [Member]
Warrant [Member]
Dec. 31, 2012
Maximum [Member]
Warrant [Member]
SearchMedia International shareholders [Member]
Equity [Line Items]                                                                
Common stock, shares issued       30,143,741   21,687,497                                                    
Stock repurchased during period, Shares                                     2,471,968   4,501,668                      
Stock repurchased during period, average price per share                                     $ 0.25                          
Common stock shares surrendered                                     2,029,700                          
Issuance of common shares for share incentive plan                                         56,087                      
Share based compensation, share vested during period                                         33,333                      
Shares issued to settle liabilities                                         22,754                      
Equity interest       100.00%                                       100.00%                
Acquisition contingent consideration payable       $ 549,000   $ 23,238,000   $ 8,205,000 $ 99,000 $ 594,000 $ 571,000                         $ 8,250,000                
Acquisition of common shares             1,000,000                                 1,000,000                
Common stock issue price per share     $ 1.00                                 $ 1.00       $ 2.00                
Gain on issuance of shares           4,340,000     6,000                             6,550,000                
Proceeds from issuance of convertible promissory notes and warrants                                             3,000,000                  
Debt instrument principal and accrued interests                                             149,000                  
Debt instrument conversion price       $ 1                                     $ 1                  
Conversion of promissory convertible notes                                             3,148,833                  
Stock issued under stock purchase agreement     6,100,000                                 855,000                        
Common stock par value per share       $ 0.0001   $ 0.0001                                         $ 0.0001          
Gross Proceeds under stock purchase agreement     6,100,000                                                          
Number of shares issued ex-owner                 158,515                               158,515 132,272            
Consideration payable in stock       6,364,000   5,210,000 1,700,000   468,000 269,000 716,000                           198,000              
Exercise of warrants 2,215,000     2,215,000 9,000                                                      
Exercise of warrants, Shares 1,771,749                                       1,771,749 1,460                    
Warrants exercised expiration date       Feb. 20, 2013                                                        
Warrants exercised extended expiration date       Dec. 26, 2013                                                        
Number of warrants held by participating holders       3,543,596                                                        
Warrants exercised price reduced 1.25     2.50                                                        
Warrants not exercised expiration date       Feb. 19, 2013                                                        
Benefit for warrant holders computed by Black-Scholes model 644,000                                                              
Warrants outstanding       10,210,699   13,607,441             15,347,401 13,400,000                                    
Warrants exercise price                           $ 6.00                             $ 6.00 $ 0.0001 $ 8.00 $ 8.1400
Warrants term, exercisable                           4 years       3 years                            
Warrants Expiry date                           Nov. 19, 2011                           Nov. 19, 2012        
Exercise price, underwriter warrants       $ 7.00                                                        
Warrants issued to the shareholders or warrant holders                         428,219       1,519,182                              
Company repurchased warrants from the open market                       1,738,500                                        
Consideration under a Board authorized plan         3,809,000             3,809,000                                        
Warrants exercised                             0 1,460                                
Net proceedings received from issuance of warrants                               9,000                                
Benefit for the warrant holders   $ 644,000