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Commitments and Contingencies - Summary of Lease Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Lease Costs [Abstract]
Operating lease expense	$ 107	$ 58	$ 332	$ 103

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- Definition

Lease Costs [Abstract]

+ References

No definition available.

+ Details

Name:	acic_LeaseCostsAbstract
Namespace Prefix:	acic_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-4

+ Details

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Balance Type:	debit
Period Type:	duration