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Related party transactions (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2015 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
License agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due to related party |  | $ 0 |  | $ 0 |  | $ 0
Broadband services agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Monthly cash fee payment | $ 20,000 |  |  |  |  |
Stock issued | 827,640 |  |  |  |  |
Related party transaction, expenses |  | $ 100,000 | $ 100,000 | $ 100,000 | $ 100,000 |

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