v3.22.2.2

Note 8 - Leases (Details Textual) - USD ($)	Mar. 26, 2021	Sep. 30, 2022	Dec. 31, 2021	[1]
Operating Lease, Right-of-Use Asset		$ 3,814,000	$ 4,302,000
Lease for Corporate Headquarters in Hayward, California [Member]
Lessee, Operating Lease, Term of Contract (Year)	2 years 3 months
Lessee, Operating Lease, Monthly Rent	$ 17,000
Lessee, Operating Lease, Abated Rent Period (Month)	1 month
Operating Lease, Right-of-Use Asset	$ 400,000
[1] The condensed consolidated balance sheet as of December 31, 2021 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021.

X

- Definition

The period of abated rent of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	acrx_LesseeOperatingLeaseAbatedRentPeriod
Namespace Prefix:	acrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of the monthly rent required for operating lease.

+ References

No definition available.

+ Details

Name:	acrx_LesseeOperatingLeaseMonthlyRent
Namespace Prefix:	acrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

X

- Details

Name:	us-gaap_LeaseContractualTermAxis=acrx_LeaseForCorporateHeadquartersInHaywardCaliforniaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: