Summary of Significant Accounting Policies - Additional Information (Details) - ASU 2014-09 - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Jan. 01, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Impact to revenues due to adoption of new standard	$ 0.2
Revenues recognized that were included in beginning deferred revenue balance	4.0
Deferred revenue due to performance obligations	$ 4.7
Retained Earnings
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Cumulative effect adjustment to retained earnings		$ 0.1

Basis of presentation and summary of significant accounting policies.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

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Amount of increase (decrease) in deferred revenue.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.A.4(a).Q1)
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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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-Topic 250
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-Section 50
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