Represents term of debt repayment in CCYY-MM-DD format.

No definition available.

Name:	avdl_DebtRepaymentTerm
Namespace Prefix:	avdl_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Final payments to acquire business gross.

+ References

No definition available.

+ Details

Name:	avdl_FinalPaymentsToAcquireBusinessGross
Namespace Prefix:	avdl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the percentage of debt repayment.

+ References

No definition available.

+ Details

Name:	avdl_LongTermDebtRepaymentPercentage
Namespace Prefix:	avdl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of earn out payment.

+ References

No definition available.

+ Details

Name:	avdl_PercentageOfEarnOutPayment
Namespace Prefix:	avdl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of royalty that has to be paid by the company as per the royalty agreement.

+ References

No definition available.

+ Details

Name:	avdl_PercentageOfRoyaltyPayableOnNetSales
Namespace Prefix:	avdl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Royalty Guarantees, Commitments, Term

+ References

No definition available.

+ Details

Name:	avdl_RoyaltyGuaranteesCommitmentsTerm
Namespace Prefix:	avdl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Total payments for business gross.

+ References

No definition available.

+ Details

Name:	avdl_TotalPaymentsForBusinessGross
Namespace Prefix:	avdl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_EscrowDeposit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying amount of the contractual right to receive fees, as compensation in exchange for providing a guarantee to a third party, over life of the guarantee.

+ References

+ Details

Name:	us-gaap_GuarantyAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount the entity has committed to make for future royalty guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 440
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473578&loc=d3e63223-108013

+ Details

Name:	us-gaap_RoyaltyGuaranteesCommitmentsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=avdl_CerecorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis=us-gaap_RoyaltyAgreementTermsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=avdl_EclatPharmaceuticalsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=avdl_DeerfieldCsfLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=avdl_FscHoldingsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Related Party Transactions (Details Textual) - USD ($)			1 Months Ended				12 Months Ended
Related Party Transactions (Details Textual) - USD ($)	Feb. 05, 2016	Dec. 03, 2013	Jan. 31, 2021	Feb. 29, 2016	Dec. 31, 2013	Feb. 28, 2013	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 10, 2019
Related Party Transaction [Line Items]
Payments to acquire businesses, gross							$ 12,736,000	$ 22,951,000	$ 37,311,000
Percentage of royalty payable on net sales					0.834%
Cerecor \| Discontinued Operations, Disposed of by Sale
Related Party Transaction [Line Items]
Guaranty assets							$ 1,821,000			$ 15,000,000
Escrow deposit										$ 15,000,000
Royalty Agreement Terms
Related Party Transaction [Line Items]
Long-term debt repayment percentage		0.834%				1.75%
Debt repayment term date		Dec. 31, 2024				Dec. 31, 2024
Eclat Pharmaceuticals
Related Party Transaction [Line Items]
Percentage of earn out payment								20.00%
Affiliated Entity \| Deerfield CSF LLC
Related Party Transaction [Line Items]
Percentage of royalty payable on net sales						1.75%
Affiliated Entity \| Deerfield CSF LLC \| FSC
Related Party Transaction [Line Items]
Payments to acquire businesses, gross				$ 1,050,000
Debt instrument, term (in years)				5 years
Percentage of royalty payable on net sales	15.00%
Scenario, Forecast \| Affiliated Entity \| Deerfield CSF LLC \| FSC
Related Party Transaction [Line Items]
Final payment to acquire business gross			$ 15,000,000
Total payments to acquire business gross			$ 20,250,000
Maximum \| Affiliated Entity \| Deerfield CSF LLC \| FSC
Related Party Transaction [Line Items]
Royalty guarantees, commitments, amount	$ 12,500,000
Royalty guarantees, commitments, term (in years)	10 years