v3.23.2

Note 4 - Asset Acquisition - Consideration for Acquisition (Details) (Parentheticals) | Jan. 07, 2022 shares
--- | ---
Lowell Therapeutics [Member] |
Business Combination, Acquiree Common Stock to Be Held Back to Satisfy Some Obligations (in shares) | 69,808

X
- Definition Represents acquiree common stock to be held back to satisfy some obligations. + References No definition available. + Details
Name: | acrx_BusinessCombinationAcquireeCommonStockToBeHeldBackToSatisfySomeObligations
Namespace Prefix: | acrx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=acrx_LowellTherapeuticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |