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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
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements for which rights to exercise lapsed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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