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Share-based compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 23, 2015
Jun. 16, 2015
Apr. 29, 2015
Apr. 27, 2015
Mar. 24, 2015
Mar. 21, 2015
Jan. 28, 2015
Jan. 01, 2008
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2011
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Unrecognized share-based compensation cost in respect of granted share options                 $ 77,000 $ 77,000      
General and Administrative Expense [Member] | Discontinued Operations [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Compensation cost recognized                 17,000 $ 20,000      
Best One Inc [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Number of equity awards                   960,000      
Two Thousand Eight Stock Incentive Plan [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Share based compensation arrangement by share options               359,299          
Increase in shares authorized                     1,200,000 900,000 600,000
2015 Stock Incentive Plan [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Share based compensation arrangement by share options       2,500,000                  
Restricted Share Units [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Restricted share units, granted   65,000 1,357,500   136,000   355,800            
Restricted share units, vesting period         Sep. 24, 2015   Jul. 28, 2015            
Restricted share units, compensation cost                 2,443 $ 2,543      
Unrecognized share-based compensation cost in respect of granted restricted share units                 $ 14,961 $ 14,961      
Share based compensation weighted average period                   1 year 7 months 2 days      
Restricted Share Units [Member] | Best One Inc [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Number of assumed equity awards outstanding of acquired entity           2,000,000     2,000,000 2,000,000      
Number of equity awards           2,000,000       2,000,000      
Share Based Compensation Description                   The RSUs vest annually beginning from October 13, 2015 only if certain performance goals of the Company are met. The shares underlying such RSUs will not be delivered until October 13, 2018, unless there is a change of control of the Company.      
Restricted Share Units [Member] | Minimum [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Restricted share units, vesting period   1 year 3 years                    
Restricted Share Units [Member] | Maximum [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Restricted share units, vesting period   3 years 4 years                    
2008 Share Inventive Plan [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Common stock reserved for future issuance                 10,568 10,568      
2015 Stock Incentive Plan [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Common stock reserved for future issuance                 1,052,500 1,052,500      
Employee Stock Option [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Share based compensation arrangement by share options 25,000                        
Number of assumed equity awards outstanding of acquired entity           960,000     960,000 960,000      
Share based compensation arrangement, vesting period 4 years                        
Employee Stock Option [Member] | Best One Inc [Member]                          
Schedule Of Weighted Average Assumptions For Fair Values Of Stock Options [Line Items]                          
Number of equity awards           960,000