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Description of Business and Significant Accounting Policies (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 financial_institution segment | Dec. 31, 2016 financial_institution
Schedule of Accounting Policies [Line Items] |  |
Service term | 1 year |
Number of reportable segments | segment | 2 |
Amortization period of inventories and supplies | 24 months |
Number of financial institutions holding cash and cash equivalents and marketable securities | financial_institution | 1 | 1
Minimum |  |
Schedule of Accounting Policies [Line Items] |  |
Days to notify cancellation of service | 30 days |
Initial period of service term | 60 days |
Maximum |  |
Schedule of Accounting Policies [Line Items] |  |
Days to notify cancellation of service | 90 days |
Initial period of service term | 120 days |

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- Definition Concentration Risk, Number of Financial Institutions Holding Cash and Cash Equivalents and Marketable Securities + References No definition available. + Details
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Period Type: | instant

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- Definition Period of Amortization of Inventories and Supplies + References No definition available. + Details
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- Definition [Line Items] for Schedule of Accounting Policies [Table] + References No definition available. + Details
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- Definition Service Agreements, Days To Cancel Agreement After Initial Period. + References No definition available. + Details
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- Definition Service Agreements, Duration of Service + References No definition available. + Details
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- Definition Service Agreements, Initial Period + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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