Related party transactions (Details) - Broadband services agreement - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Nov. 15, 2015
Related Party Transaction [Line Items]
Monthly cash fee payment			$ 20,000
Related party transaction, expenses	$ 100,000	$ 200,000
Due to related party	$ 100,000	$ 0.0

Carrying amount as of the balance sheet date of obligations due all related parties.

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+ Details