v3.20.4

Summary of significant accounting policies - Concentrations of credit risk (Details)			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total Revenue | Entities affiliated with T-Mobile
Concentrations of credit risk
Concentration risk percentage			21.00%	20.00%	26.00%
Total Revenue | Entities affiliated with AT&T Inc.
Concentrations of credit risk
Concentration risk percentage			13.00%	12.00%
Total Revenue | Entities affiliated with Verizon Communications Inc.
Concentrations of credit risk
Concentration risk percentage			11.00%	11.00%	11.00%
Total accounts receivable | Entities affiliated with T-Mobile
Concentrations of credit risk
Concentration risk percentage	13.00%	13.00%
Total accounts receivable | Entities affiliated with AT&T Inc.
Concentrations of credit risk
Concentration risk percentage	27.00%	34.00%
Total accounts receivable | Entities affiliated with Verizon Communications Inc.
Concentrations of credit risk
Concentration risk percentage	11.00%

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