v3.22.2.2

Note 14 - Subsequent Event (Details Textual) - shares	Oct. 25, 2022	Sep. 23, 2022
Reverse Stock Split, Number of Shares Converted (in shares)		30
Subsequent Event [Member]
Reverse Stock Split, Number of Shares Converted (in shares)	20

X

- Definition

Number of shares converted to one share as a result of a reverse stock split.

+ References

No definition available.

+ Details

Name:	acrx_ReverseStockSplitNumberOfSharesConverted
Namespace Prefix:	acrx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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