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Share-based compensation - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
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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 |  |  |  |  |  |  |

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