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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Spectrum Inc.
Related Party Transaction [Line Items]
Spectrum Acquisition, tax preparation and other fees	$ 0.2	$ 0.2
Principal Owner
Related Party Transaction [Line Items]
Accrued refunds current		$ 1.7
Principal Owner | Minimum | Spectrum Inc.
Related Party Transaction [Line Items]
Non controlling ownership interest minimum	10.00%

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- Definition

Accrued refunds current.

+ References

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874292-224272

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section 45
-Paragraph 3
-Subparagraph (k)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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