General information (Details)	Dec. 31, 2017 Platform
General information [Abstract]
Number of proprietary technology platforms	2

The number of unique proprietary platform technologies to discover, design and develop medicines and diagnostics to target misfolded proteins.

No definition available.

Name:	aciu_NumberOfTechnologyPlatforms
Namespace Prefix:	aciu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant