v3.23.2

Note 16 - Net Income (Loss) Per Share of Common Stock (Details Textual) | Dec. 29, 2022 $ / shares
--- | ---
The 2022 Prefunded Warrants [Member] |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.0001

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
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=acrx_The2022PrefundedWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |