v2.4.0.6
Business Combinations (Narrative) (Details) (USD $)
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
Dec. 31, 2011
Dec. 31, 2010
Nov. 11, 2009
Certifica [Member]
years
Dec. 31, 2009
Certifica [Member]
Feb. 19, 2010
ARSgroup [Member]
years
Feb. 19, 2009
ARSgroup [Member]
Dec. 31, 2010
ARSgroup [Member]
Jul. 02, 2010
Nexius, Inc. [Member]
years
Dec. 31, 2011
Nexius, Inc. [Member]
Dec. 31, 2010
Nexius, Inc. [Member]
Jun. 30, 2011
Nexius, Inc. [Member]
Aug. 31, 2010
Nedstat B.V. [Member]
years
Dec. 31, 2011
Nedstat B.V. [Member]
Dec. 31, 2010
Nedstat B.V. [Member]
Jun. 30, 2011
Nedstat B.V. [Member]
Aug. 11, 2011
AdXpose Inc [Member]
Aug. 11, 2010
AdXpose Inc [Member]
Dec. 31, 2011
AdXpose Inc [Member]
Nov. 11, 2009
Customer Relationships [Member]
Certifica [Member]
Feb. 19, 2010
Customer Relationships [Member]
ARSgroup [Member]
Jul. 02, 2010
Customer Relationships [Member]
Nexius, Inc. [Member]
Aug. 31, 2010
Customer Relationships [Member]
Nedstat B.V. [Member]
Aug. 11, 2011
Customer Relationships [Member]
AdXpose Inc [Member]
years
Nov. 11, 2009
Trade Name [Member]
Certifica [Member]
Feb. 19, 2010
Trade Name [Member]
ARSgroup [Member]
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]
Nov. 11, 2009
Core Technology [Member]
Certifica [Member]
Jul. 02, 2010
Core Technology [Member]
Nexius, Inc. [Member]
Aug. 31, 2010
Core Technology [Member]
Nedstat B.V. [Member]
Feb. 19, 2010
Methodology And Database [Member]
ARSgroup [Member]
Aug. 11, 2011
Developed Technology [Member]
AdXpose Inc [Member]
years
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