Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Equity Offering and Stock-Based Compensation Plan (Schedule of Stock Option Activity) (Details)

v2.4.0.8
Equity Offering and Stock-Based Compensation Plan (Schedule of Stock Option Activity) (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Number of Options Outstanding        
Shares under option at January 1, 2013     3,315,917  
Granted     358,239  
Exchanged for MakerBot options from merger     77,631  
Exercised (618,006) (115,660) (1,265,673) (207,800)
Forfeited     (26,651)  
Shares under option at September 30, 2013 2,459,463   2,459,463  
Shares exercisable under option at September 30, 2013 1,412,361   1,412,361  
Weighted Average Exercise Price        
Shares under option at January 1, 2013     $ 11.83  
Granted     $ 84.88  
Exchanged for MakerBot options from merger     $ 4.76  
Exercised     $ 7.91  
Forfeited     $ 34.80  
Shares under option at September 30, 2013 $ 24.03   $ 24.03  
Shares exercisable under option at September 30, 2013 $ 8.94   $ 8.94  
Minimum [Member]
        
Number of Options Outstanding        
Shares under option at January 1, 2013     2.21  
Weighted Average Exercise Price        
Granted     $ 74.95  
Exchanged for MakerBot options from merger     $ 2.74  
Exercised     $ 2.21  
Forfeited     $ 6.52  
Shares under option at September 30, 2013 $ 2.21   $ 2.21  
Shares exercisable under option at September 30, 2013 $ 2.21   $ 2.21  
Maximum [Member]
        
Number of Options Outstanding        
Shares under option at January 1, 2013     46.87  
Weighted Average Exercise Price        
Granted     $ 91.56  
Exchanged for MakerBot options from merger     $ 7.30  
Exercised     $ 46.87  
Forfeited     $ 46.87  
Shares under option at September 30, 2013 $ 91.56   $ 91.56  
Shares exercisable under option at September 30, 2013 $ 46.87   $ 46.87