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

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Number of shares of stock issued during the period that is attributable to transactions involving issuance of stock not separately disclosed. + References No definition available. + Details
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