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Organization and Significant Accounting Policies - Revenue Recognition and Sales and Marketing Expenses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Revenue recognition, customer contract period, min | 3 months |  |
Revenue recognition, customer contract period, max | 36 months |  |
Sales commissions amortization period | 12 months |  |
Advertising expense | $ 2.7 | $ 2.7 | $ 2.8

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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