Property and equipment: Installment payment agreement (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($) payment	Dec. 31, 2019 USD ($)
Installment payment agreement
Unamortized discount	$ 245	$ 350
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	$ 10,400	12,500
Unamortized discount	$ 300	$ 400

Amount, after accumulated amortization, of debt discount.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant