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Commitments And Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
DSM Desotech [Member]
item
Jan. 31, 2013
DSM Desotech [Member]
item
Jun. 30, 2014
Formlabs, Inc. and Kickstarter, Inc. [Member]
item
Jun. 30, 2014
Formlabs, Inc. [Member]
item
Apr. 30, 2014
Subsequent Event [Member]
DSM Desotech [Member]
item
Commitments And Contingencies [Line Items]                    
Rent expense under operating leases $ 2,598 $ 1,440 $ 4,910 $ 2,818            
Supply commitments, printer assembly 65,621   65,621   41,091          
Accrued liability recorded for earnouts $ 10,120   $ 10,120   $ 5,578          
Number of granted summary judgments by the court             7      
Patents allegedly infringed           2   1 8  
Number of count dismissed                   7