v3.23.2

Note 10 - Leases (Details Textual)		12 Months Ended
	Mar. 26, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) ft²		Apr. 30, 2021 USD ($)
Gain (Loss) on Termination of Lease	$ 500,000	$ (0)	$ 522,000
Operating Lease, Right-of-Use Asset		$ 96,000	$ 271,000	[1]
Prepaid Expenses and Other Current Assets [Member]
Lessee, Operating Sublease, Deferred Costs					$ 300,000
Lease for Corporate Headquarters in Hayward, California [Member]
Area of Real Estate Property (Square Foot) | ft²			12,106
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, 2020 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, 2020.

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

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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

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

X

- Definition

Amount of asset related to consideration paid in advance for operating sublease deferred costs.

+ References

No definition available.

+ Details

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

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
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X

- Definition

Amount of gain (loss) on termination of lease before expiration of lease term.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479092/842-20-40-1

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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
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

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Namespace Prefix:	us-gaap_
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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
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

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Period Type:	instant

X

- Details

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X

- Details

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Balance Type:
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