Related Parties (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
InnerWorkings
         
Related parties:          
Company shares owned by affiliated entities 21,123   21,123    
Percentage of total shares outstanding owned by affiliate 0.10%   0.10%    
Revenue from transactions with related party $ 2,278,066 $ 2,750,074 $ 8,143,867 $ 6,596,325  
Due from related parties 1,865,718   1,865,718   1,800,181
Due to related parties 41,059   41,059   148,443
Groupon Goods
         
Related parties:          
Revenue from transactions with related party 1,259,867   1,908,685    
Lefkofsky & Gorosh, P.C.
         
Related parties:          
Amounts of transaction with related party $ 22,510 $ 1,998 $ 72,717 $ 36,220