Related party transactions (Details) - Broadband services agreement - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Nov. 30, 2015
Related Party Transaction [Line Items]
Due to related party	$ 0		$ 0
Monthly cash fee payment				$ 20,000
Related party transaction, expenses	$ 100,000	$ 100,000

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details