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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Contingencies |  |  |
Uncertain tax positions | $ 1,678 us-gaap_UnrecognizedTaxBenefits | $ 1,901 us-gaap_UnrecognizedTaxBenefits | $ 2,384 us-gaap_UnrecognizedTaxBenefits
Inventories |  |  |
Schedule of Contingencies |  |  |
Long-term purchase commitment, amount | $ 3,830 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = us-gaap_InventoriesMember |  |

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Details
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