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Commitments And Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
DSM Desotech [Member]
item
Jan. 31, 2013
DSM Desotech [Member]
item
Mar. 31, 2014
Formlabs, Inc. and Kickstarter, Inc. [Member]
item
Mar. 31, 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 $ 2,311 $ 1,378            
Supply commitments, printer assembly 61,021   41,091          
Business acquisition, deferred purchase price 4,500   4,500          
Accrued liability recorded for earnouts $ 10,015   $ 5,578          
Number of granted summary judgements by the court         7      
Patents allegedly infringed       2   1 8  
Number of count dismissed               7