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Other Revenues and Cost of Revenue	12 Months Ended
Other Revenues and Cost of Revenue	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Other Revenues and Cost of Revenue	Note 3. Other Revenues and Cost of Revenue Other revenues are primarily comprised of product revenue from the sale of pre-configured phones, phone rentals, and professional services. For the years ended December 31, 2017, 2016 and 2015, the majority of other revenues consisted of product revenues from sales of phones. Product revenues were $26.0 million, $13.3 million, and $23.3 million for the years ended December 31, 2017, 2016 and 2015, respectively. Product cost of revenues were $25.0 million, $15.8 million, and $20.3 million for the years ended December 31, 2017, 2016, and 2015, respectively.