Summary of Potentially Dilutive Common Stock Equivalents (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Average unamortized share-based compensation expense:
Exercise prices on common stock options, lower range	$ 3.00	$ 3.00
Exercise prices on common stock options, upper range	10.00	10.00
Weighted average exercise price of the Warrants	$ 5.64	$ 5.64
Restricted Common Stock Awards
Average unamortized share-based compensation expense:
Average unamortized share-based compensation expense	$ 0.5	$ 2.2
Restricted Stock Unit Awards
Average unamortized share-based compensation expense:
Average unamortized share-based compensation expense	$ 0.3	$ 1.8

The average unamortized share-based compensation expense during the period.

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- Definition

Average unamortized share-based compensation expense.

+ References

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- Definition

Class Of Warrant Or Right Exercise Price Of Warrants Or Rights Weighted Average Price.

+ References

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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