Retirement Plans (Details) - Forge Nano, Inc. - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Retirement Plans
Contributions	$ 423	$ 385
Defined Contribution Plan, Type [Extensible Enumeration]	us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember	us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember

Amount of cost for defined contribution plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates type of defined contribution plan. Includes, but is not limited to, pension plan, other postretirement plan and special and contractual termination benefits payable upon retirement.

+ References

+ Details

Name:	us-gaap_DefinedContributionPlanTypeExtensibleList
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=none_ForgeNanoIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: