Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Computation of net income (loss) per share (Narrative) (Details)

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Computation of net income (loss) per share (Narrative) (Details)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Computation of net income (loss) per share [Abstract]      
Stock options, RSUs and shares held back in connection with the MakerBot transaction to purchase shares excluded from computation of diluted net income (loss) per share, ecause their inclusion would have had an anti-dilutive effect on the diluted net income (loss) per share 3.0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2.9us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount