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Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Product sales |
Percentage of current wholesale acquisition price to be deducted from gross invoice sales price to record deferred revenue | 5.00%
Nonrefundable revenue recognized | $ 0

X
- Definition Represents the percentage of current wholesale acquisition price to be deducted from gross invoice sales price to record deferred revenue. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition This item represents the amount of revenue recognized which is attributable to customer refundable fees that are no longer refundable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a)) -URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A -Paragraph a -Subsection 4 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Period Type: | duration