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Revenue Recognition (Analysis of Product Return Liability) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Revenue Recognition |  |
Beginning balance | $ 2,621 | $ 2,408
Provision for product returns | (255) | 803
Credits issued to third parties | (493) | (630)
Ending balance | $ 1,873 | $ 2,581
Aggregate product return rate | 1.10% | 1.10%

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- Definition Represents the aggregate product return rate percentage of qualified sales. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the provision for sales returns liability during the period. + References No definition available. + Details
Name: | amph_RevenueRecognitionSalesReturnsLiability
Namespace Prefix: | amph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Amount of estimated sales returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51655414&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 15 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51671139&loc=d3e47468-111626 + Details
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- Definition Total deduction from sales during the period arising from goods returned by customers (other than under warranty provisions) and price reductions (allowance, price protection agreements) given by the entity. Returns and allowances are a deduction from gross revenue in arriving at net revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | debit
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