Property and equipment: Installment payment agreement (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) payment	Dec. 31, 2019 USD ($)
Installment payment agreement
Unamortized discount		$ 291	$ 350
Network equipment
Installment payment agreement
Purchase agreement, term (in years)	3 years
Purchase agreement, required annual purchase amount	$ 35,000
Purchase agreement, amount ordered	20,000
Purchase agreement amount shipped	$ 6,800
Network equipment | Note obligations
Installment payment agreement
Term of debt (in months)		24 months
Number of payments first six months | payment		0
Number of equal payments | payment		18
Outstanding obligation		$ 12,800	12,500
Unamortized discount		$ 300	$ 400