Revenue and Deferred Revenue - Remaining performance obligation (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Revenue and Deferred Revenue
Revenue remaining performance obligation	$ 38.1	$ 34.0
Performance obligation not yet started	3.7	3.6
Network design and installation
Revenue and Deferred Revenue
Revenue remaining performance obligation	7.6	8.2
Internet network services and hardware and internet service
Revenue and Deferred Revenue
Revenue remaining performance obligation	30.5	25.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue and Deferred Revenue
Revenue remaining performance obligation		$ 13.4
Expected timing of satisfaction		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01
Revenue and Deferred Revenue
Revenue remaining performance obligation	$ 13.7
Expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Revenue and Deferred Revenue
Revenue remaining performance obligation	$ 24.4	$ 21.5
Expected timing of satisfaction	6 years	6 years

Amount of contract with customer remaining performance obligation not yet started.

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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- 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

No definition available.

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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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