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Organization and Significant Accounting Policies - Accounting Policies (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Capitalized cost, amortization period under new and prior guidance |  | 12 months
Revenue recognition, customer contract period, min | 3 months |
Revenue recognition, customer contract period, max | 36 months |
Sales commissions amortization period | 3 years |
Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Capitalized cost, amortization period under new and prior guidance | 3 years |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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