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Summary of Significant Accounting Policies - Software Development Costs (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2018
Software Development Costs |  |
Software development costs capitalized | $ 0 | $ 0
Capitalized Technology | Minimum |  |
Software Development Costs |  |
Estimated useful lives of assets |  | 2 years
Capitalized Technology | Maximum |  |
Software Development Costs |  |
Estimated useful lives of assets |  | 5 years

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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