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Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Benefit Plan [Abstract]
Defined Contribution Plan, Cost	$ 1.0	$ 1.0	$ 0.7
Years of service	4 years

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- Definition

Benefit Plan [Abstract]

+ References

No definition available.

+ Details

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X

- Definition

Defined Contribution Plan, Requisite Service Period

+ References

No definition available.

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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