Segment, Customer Concentration and Geographical Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 Business_Unit Location	Dec. 31, 2018 Location
Revenue, Major Customer [Line Items]
Number of primary business units | Business_Unit	1
Number of geographic locations | Location	3	3
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Concentration percentage	92.00%	82.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Sprint and Fast Spring [Member]
Revenue, Major Customer [Line Items]
Concentration percentage	92.00%	82.00%
Customer Concentration Risk [Member] | Revenues [Member] | Sprint and Affiliates [Member] | Wireless [Member]
Revenue, Major Customer [Line Items]
Concentration percentage	84.00%	81.00%