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Business Combinations (Narrative) (Details) (USD $)
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12 Months Ended | 0 Months Ended | 2 Months Ended | 0 Months Ended | 10 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 5 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Nov. 11, 2009
Certifica [Member]
years
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Dec. 31, 2009
Certifica [Member]
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Feb. 19, 2010
ARSgroup [Member]
years
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Feb. 19, 2009
ARSgroup [Member]
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Dec. 31, 2010
ARSgroup [Member]
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Jul. 02, 2010
Nexius, Inc. [Member]
years
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Dec. 31, 2011
Nexius, Inc. [Member]
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Dec. 31, 2010
Nexius, Inc. [Member]
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Jun. 30, 2011
Nexius, Inc. [Member]
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Aug. 31, 2010
Nedstat B.V. [Member]
years
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Dec. 31, 2011
Nedstat B.V. [Member]
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Dec. 31, 2010
Nedstat B.V. [Member]
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Jun. 30, 2011
Nedstat B.V. [Member]
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Aug. 11, 2011
AdXpose Inc [Member]
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Aug. 11, 2010
AdXpose Inc [Member]
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Dec. 31, 2011
AdXpose Inc [Member]
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Nov. 11, 2009
Customer Relationships [Member]
Certifica [Member]
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Feb. 19, 2010
Customer Relationships [Member]
ARSgroup [Member]
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Jul. 02, 2010
Customer Relationships [Member]
Nexius, Inc. [Member]
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Aug. 31, 2010
Customer Relationships [Member]
Nedstat B.V. [Member]
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Aug. 11, 2011
Customer Relationships [Member]
AdXpose Inc [Member]
years
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Nov. 11, 2009
Trade Name [Member]
Certifica [Member]
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Feb. 19, 2010
Trade Name [Member]
ARSgroup [Member]
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Jul. 02, 2010
Trade Name [Member]
Nexius, Inc. [Member]
|
Aug. 31, 2010
Trade Name [Member]
Nedstat B.V. [Member]
|
Dec. 31, 2011
Trade Name [Member]
AdXpose Inc [Member]
years
|
Aug. 11, 2011
Trade Name [Member]
AdXpose Inc [Member]
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Nov. 11, 2009
Core Technology [Member]
Certifica [Member]
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Jul. 02, 2010
Core Technology [Member]
Nexius, Inc. [Member]
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Aug. 31, 2010
Core Technology [Member]
Nedstat B.V. [Member]
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Feb. 19, 2010
Methodology And Database [Member]
ARSgroup [Member]
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Aug. 11, 2011
Developed Technology [Member]
AdXpose Inc [Member]
years
|
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| Business Acquisition [Line Items] | ||||||||||||||||||||||||||||||||||
| Business acquisition date | November 11, 2009 | February 19, 2010 | July 1, 2010 | August 31, 2010 | August 11, 2011 | |||||||||||||||||||||||||||||
| Transaction related costs | $ 700,000 | $ 2,600,000 | $ 20,900,000 | $ 19,400,000 | ||||||||||||||||||||||||||||||
| Acquisition resulted in goodwill | 1,900,000 | 8,100,000 | 14,000,000 | 700,000 | 21,000,000 | 100,000 | 16,027,000 | 16,000,000 | ||||||||||||||||||||||||||
| Total purchase price | 17,700,000 | 19,421,000 | ||||||||||||||||||||||||||||||||
| Liabilities related to uncertain tax positions | 700,000 | |||||||||||||||||||||||||||||||||
| Definite-lived intangible assets | 1,200,000 | 9,500,000 | 17,100,000 | 18,700,000 | 925,000 | 900,000 | 900,000 | 4,100,000 | 14,500,000 | 15,300,000 | 100,000 | 200,000 | 1,300,000 | 1,000,000 | 1,500,000 | 100,000 | 100,000 | 1,600,000 | 1,900,000 | 4,100,000 | 700,000 | |||||||||||||
| Definite-lived intangible assets useful life, minimum (in years) | 2 | 2 | 2 | 2 | ||||||||||||||||||||||||||||||
| Definite-lived intangible assets useful life (in years) | 3 | 1.5 | 5 | |||||||||||||||||||||||||||||||
| Definite-lived intangible assets useful life, maximum (in years) | 7 | 10 | 12 | 7 | ||||||||||||||||||||||||||||||
| Revenue related to acquiree | 200,000 | 18,100,000 | 3,400,000 | 3,600,000 | 1,500,000 | |||||||||||||||||||||||||||||
| Remaining estimated merger consideration | 15,300,000 | |||||||||||||||||||||||||||||||||
| Cash paid to acquired entity | 3,000,000 | 34,400,000 | 4,400,000 | |||||||||||||||||||||||||||||||
| Number of shares issued as consideration | 974,358 | 158,070 | 158,070 | 58,045 | 58,045 | 982,285 | ||||||||||||||||||||||||||||
| Value of shares issued as consideration | $ 2,600,000 | $ 1,100,000 | $ 15,000,000 | |||||||||||||||||||||||||||||||
| Number of key shareholders | 2 | |||||||||||||||||||||||||||||||||