Other Intangible Assets, Other than Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Amortized intangible assets:
Gross carrying amount	$ 20,716	$ 20,716
Accumulated amortization	17,157	16,204
Unamortized intangible assets:
In-process research and development	722us-gaap_ResearchAndDevelopmentInProcess	722us-gaap_ResearchAndDevelopmentInProcess
Technology [Member]
Amortized intangible assets:
Gross carrying amount	11,774	11,774
Weighted average amortization period	7 years	7 years
Accumulated amortization	8,281	7,430
Customer relationship [Member]
Amortized intangible assets:
Gross carrying amount	8,100	8,100
Weighted average amortization period	7 years	7 years
Accumulated amortization	8,100	8,004
Patents [Member]
Amortized intangible assets:
Gross carrying amount	842	842
Weighted average amortization period	6 years	6 years
Accumulated amortization	$ 776	$ 770

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 730

-SubTopic 10

-Section 50

-Paragraph 1

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