Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Management fee, percent fee	8.00%
Net service fee, percent fee	8.60%
Management fee retained, percent fee	6.00%
Remaining performance obligations	$ 3.4
Revenue remaining performance obligation, per year	$ 0.8
Broadband
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized contract cost, amortization period	4 years
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reimbursement payment, cost of equipment and commissions, benefit period for recognition	21 months
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reimbursement payment, cost of equipment and commissions, benefit period for recognition	53 months
Sprint
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Monthly revenue from contract with customer	$ 1.5
Customer concentration risk | Revenue | Sprint
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk	70.00%	71.00%	72.00%
Customer concentration risk | Accounts receivable | Sprint
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk	80.00%	80.00%