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Summary of Significant Accounting Policies - New Accounting Pronouncements - Revenue Recognition (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Initial application period, revenue recognition cumulative effect |  |  |
Effect on other assets |  | $ 5,229 | $ 4,756
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09 |  |  |
Initial application period, revenue recognition cumulative effect |  |  |
Percent of annual revenue expected to be used to estimate amount of adjustment to retained earnings |  | 6.00% |
Sales commission expense |  | $ 4,250 |
Calculated under Revenue Guidance in Effect before Topic 606 | ASU 2014-09 | Maximum |  |  |
Initial application period, revenue recognition cumulative effect |  |  |
Contract costs, amortization period |  | 4 years |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 | Sales Commissions | Forecast Adjustment | Maximum |  |  |
Initial application period, revenue recognition cumulative effect |  |  |
Contract costs, amortization period | 7 years |  |

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- Definition Primarily represents commissions incurred in the period based upon the sale by commissioned employees or third parties of the entity's goods or services, and fees for sales assistance or product enhancements performed by third parties (such as a distributor or value added reseller). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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