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Acquisition (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Summary of identifiable intangible assets acquired and their respective weighted average lives |
Intangible Assets, Assigned Value | $ 4,815
Customer relationships [Member] |
Summary of identifiable intangible assets acquired and their respective weighted average lives |
Intangible Assets, Assigned Value | 3,605
Intangible Assets, Useful Life | 7 years 6 months
Research content [Member] |
Summary of identifiable intangible assets acquired and their respective weighted average lives |
Intangible Assets, Assigned Value | 1,080
Intangible Assets, Useful Life | 1 year 6 months
Backlog [Member] |
Summary of identifiable intangible assets acquired and their respective weighted average lives |
Intangible Assets, Assigned Value | $ 130
Intangible Assets, Useful Life | 1 year

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, 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 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of acquisition cost of a business combination allocated to assets, excluding financial assets and goodwill, lacking physical substance. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration