v3.23.1

Note 11 - Subsequent Events (Details Textual) $ / shares in Units, $ in Millions	Apr. 03, 2023 USD ($)	Apr. 25, 2023 $ / shares	Apr. 03, 2023 EUR (€)	Mar. 12, 2023 USD ($)
Subsequent Event [Member] | December 2022 Financing [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.00
Subsequent Event [Member] | Loan Agreement with Oxford Finance LLC [Member]
Repayments of Debt	$ 3.4
Subsequent Event [Member] | Aguettant [Member] | PFS Products [Member]
Licensing Agreement, Complementary Payment | €			€ 1,500,000
Subsequent Event [Member] | Aguettant [Member] | PFS Products [Member] | Maximum [Member]
Licensing Agreement, Milestone Payments	21.0
DSUVIA [Member] | Discontinued Operations [Member]
Disposal Group, Including Discontinued Operation, Maximum Amount in Sales-based Milestone				$ 116.5
Disposal Group, Including Discontinued Operation, Percentage of Royalty on Commercial Sales				15.00%
DSUVIA [Member] | Discontinued Operations [Member] | Department of Defense [Member]
Disposal Group, Including Discontinued Operation, Percentage of Royalty on Commercial Sales				75.00%
DSUVIA [Member] | Discontinued Operations [Member] | Subsequent Event [Member]
Disposal Group, Including Discontinued Operation, Maximum Amount in Sales-based Milestone	$ 116.5
Disposal Group, Including Discontinued Operation, Percentage of Royalty on Commercial Sales	15.00%		15.00%
Disposal Group, Including Discontinued operations, Percentage of Sales, Excluding Royalty Payments	20.00%		20.00%
DSUVIA [Member] | Discontinued Operations [Member] | Subsequent Event [Member] | Department of Defense [Member]
Disposal Group, Including Discontinued Operation, Percentage of Royalty on Commercial Sales	75.00%		75.00%

X

- Definition

Maximum amount in sales-based milestone for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	acrx_DisposalGroupIncludingDiscontinuedOperationMaximumAmountInSalesbasedMilestone
Namespace Prefix:	acrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of royalty on commercial sales as a percentage for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

Name:	acrx_DisposalGroupIncludingDiscontinuedOperationPercentageOfRoyaltyOnCommercialSales
Namespace Prefix:	acrx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of sales excluding royalty payments for disposal group including discontinued operations

+ References

No definition available.

+ Details

Name:	acrx_DisposalGroupIncludingDiscontinuedOperationsPercentageOfSalesExcludingRoyaltyPayments
Namespace Prefix:	acrx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of complementary payment to be received as part of a licensing agreement.

+ References

No definition available.

+ Details

Name:	acrx_LicensingAgreementComplementaryPayment
Namespace Prefix:	acrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents licensing agreement, milestone payment liabilities.

+ References

No definition available.

+ Details

Name:	acrx_LicensingAgreementMilestonePayments
Namespace Prefix:	acrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=acrx_December2022FinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=acrx_LoanAgreementWithOxfordFinanceLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_ProductOrServiceAxis=acrx_PFSProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	srt_MajorCustomersAxis=acrx_DepartmentOfDefenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: