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Customer Concentration (Tables) | 12 Months Ended
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Dec. 31, 2018
Significant Contractual Relationship [Abstract] |
Schedules of Concentration of Risk, by Risk Factor | Accounts receivable from significant clients, those representing 10% or more of total accounts receivable for the dates noted, are summarized below:
|  | December 31,
($ in thousands) |  | 2018 |  | 2017
Sprint |  | $43,227 |  | $43,405
% of total accounts receivable |  | 79% |  | 80%
Correspondingly, revenue from significant clients, those representing 10% or more of total revenue for the respective periods, is summarized as follows:
|  | Year Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Sprint |  | 68% |  | 72% |  | 69%

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