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Summary of Significant Accounting Policies - Software Development Costs (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Software Development Costs
Software development costs capitalized	$ 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

X

- 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

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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

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