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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2009
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Appeal bond, amount |  |  |  | $ 729 | $ 729 | $ 729 |  |
Liabilities recorded at fair value |  |  |  | 1,989 |  |  |  |
Outstanding purchase commitments for inventory components |  |  | $ 8,959 | 9,972 |  |  |  |
Rudolph [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation awarded value |  | $ 15,750 |  |  |  |  |  |
Appeal bond, amount |  | $ 7,875 |  |  |  |  |  |
Rudolph [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation awarded value | $ 14,600 |  |  |  |  |  |  |
Litigation previously awarded value | $ 14,500 |  |  |  |  |  |  |
OCS [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Percent of sales derived from research and development, committed amount payable |  |  | 3.50% |  |  |  |  |
Accrued interest |  |  |  |  |  |  | $ 648 | $ 648
OCS [Member] | Printar [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Grants received including interest accrued |  |  | $ 6,256 | 6,029 |  |  | $ 598 | $ 598
Liabilities recorded at fair value |  |  | 4,130 | 3,670 |  |  |  |
OCS [Member] | SELA [Member] |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Grants received including interest accrued |  |  | 0 | 2,352 |  |  |  |
Liabilities recorded at fair value |  |  | $ 0 | $ 60 |  |  |  |

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