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Summary of Significant Accounting Policies - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Stock split ratio	2

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- References

No definition available.

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

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