Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008 item	Nov. 30, 2012 Formlabs, Inc. and Kickstarter, Inc. [Member] item	Nov. 30, 2013 Formlabs, Inc. [Member] item	Jan. 31, 2013 Anticompetitive Behavior [Member] item
Rent expense under operating leases	$ 6,891	$ 4,968	$ 2,738
Supply commitments, printer assembly	41,091	10,894
Business acquisition, deferred purchase price	4,500
Accrued liability recorded for earnouts	$ 5,578	$ 2,647
Number of granted summary judgements by the court							7
Patents allegedly infringed				2	1	8