Statements of Cash Flows (Parenthetical) SFr in Millions	12 Months Ended
Dec. 31, 2016 CHF (SFr)
Financing activities
Underwriting fees	SFr 5.1

The value of underwriting fees in a noncash transaction related to share issue costs.

No definition available.

Name:	aciu_UnderwritingFeesInNoncashFinancingActivities
Namespace Prefix:	aciu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration