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Technology Agreements (Details) (Network-1 MOU, USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 16, 2010 | Jun. 27, 2010
Network-1 MOU |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |
Term of license agreement | 9 years 8 months |
Fees for grant of license | $ 2.4 |
Fees for grant of license expensed to cost of goods sold |  | 0.2
Fees for grant of license expensed to litigation settlement |  | 0.8
Capitalized fees for grant of license |  | $ 1.4

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- Definition Collaborative Arrangement, Technology Agreement, Capitalized Professional Fees for Setup of Agreement + References No definition available. + Details
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Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaborative Arrangement, Technology Agreement, Professional Fees for Setup + References No definition available. + Details
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Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Collaborative Arrangement, Technology Agreement, Professional Fees for Setup of Agreement Expensed to Cost of Goods Sold + References No definition available. + Details
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Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaborative Arrangement, Technology Agreement, Professional Fees for Setup of Agreement Expensed to Litigation Settlement + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaborative Arrangement, Term of Agreement + References No definition available. + Details
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Namespace Prefix: | extr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration