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Geographic Concentrations	12 Months Ended
Geographic Concentrations	Dec. 31, 2017
Risks And Uncertainties [Abstract]
Geographic Concentrations	(16) Geographic Concentrations Revenue by location is determined by the billing address of the customer. Approximately 90%, 90% and 86% of the Company’s revenue was from the United States for the fiscal years ended December 31, 2017, 2016 and 2015, respectively. No other individual country comprised more than 10% of total revenue for the fiscal years ended December 31, 2017, 2016 and 2015. Property and equipment by geographic location is based on the location of the legal entity that owns the asset. As of December 31, 2017 and 2016, more than 88% of the Company’s property and equipment was located in the United States.