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Commitments and Contingencies - Summary of Operating and Lease Asset and Liability Balances (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Lease Assets and Liabilities [Abstract] |  |
Operating lease assets | $ 3,078 | $ 3,209
Operating lease liabilities | $ 3,248 | $ 3,323

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- Definition Lease Assets and Liabilities [Abstract] + References No definition available. + Details
Name: | acic_LeaseAssetsandLiabilitiesAbstract
Namespace Prefix: | acic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant