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Capitalization - Modification of Series B Preferred Stock (Detail) - Series B convertible preferred stock $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Convertible Preferred Stock
Adjustment to net income attributable to common stockholders due to modification	$ 3.8
Fair value adjustment	$ 3.8

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Amount of addition (reduction) to the amount at which an instrument classified in shareholders' equity could be incurred (settled) in a current transaction between willing parties.

+ References

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- Definition

The excess of (1) the fair value of all securities and other consideration transferred in transactions by the registrant to the holders of the convertible preferred stock over (2) the fair value of securities issuable pursuant to the original conversion terms, during the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section S99
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695

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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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