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Customer and Supplier Concentration (Details) - Customer Concentration Risk [Member] - item | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Revenue, Major Customer [Line Items] |  |  |  |  |
Number of major customers that are wholesale distributors |  |  | 3 |  |
Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Number of major customers |  |  | 4 |  | 4
Revenue Benchmark [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Number of major customers | 4 | 4 | 4 | 4 |
McKesson [Member] | Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 29.00% |  | 26.00%
McKesson [Member] | Revenue Benchmark [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 26.00% | 22.00% | 25.00% | 25.00% |
Cencora [Member] | Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 28.00% |  | 16.00%
Cencora [Member] | Revenue Benchmark [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 21.00% | 17.00% | 20.00% | 20.00% |
Cardinal Health [Member] | Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 17.00% |  | 13.00%
Cardinal Health [Member] | Revenue Benchmark [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 20.00% | 15.00% | 20.00% | 16.00% |
Lilly [Member] | Accounts Receivable [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 2.00% |  | 20.00%
Lilly [Member] | Revenue Benchmark [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 1.00% | 16.00% | 4.00% | 6.00% |

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- Definition Number of major customers. + References No definition available. + Details
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Namespace Prefix: | amph_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of major customers that are wholesale distributors of the reporting entity's products. + References No definition available. + Details
Name: | amph_NumberOfMajorCustomersWholesaleDrugDistributors
Namespace Prefix: | amph_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-20 + Details
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Balance Type: | na
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | srt_MajorCustomersAxis=amph_McKessonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=amph_CencoraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=amph_CardinalHealthMember
Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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