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Summary of Warrant (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Shares [Abstract]
Number of warrants, Outstanding	3,331,995
Warrants granted	0
Warrants exercised	(11,516)
Warrants forfeited	0
Number of warrants, Outstanding	3,320,479	3,331,995
Weighted Average Exercise Price [Abstract]
Warrants outstanding Balance	$ 9.93
Warrants granted	0
Warrants exercised	9.81
Warrants forfeited	0
Warrants outstanding Balance	$ 9.93	$ 9.93
Weighted Average Remaining Contractual Term Years [Abstract]
Warrants outstanding Balance	2 years 8 months 19 days	2 years 11 months 19 days
Aggregate Intrinsic Value [Abstract]
Warrants outstanding Balance	$ 27.9	$ 33.1
Warrants granted	0.0
Warrants exercised	0.1
Warrants forfeited	$ 0.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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