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Net Loss per Share of Common Stock - Summary of Computation of Basic and Diluted Net Loss Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net loss attributable to common stockholders - basic and diluted	$ (22,006)	$ (44,985)
Weighted-average shares outstanding	27,810	2,788
Weighted-average shares used to compute basic and diluted net loss per share	27,810	2,788
Basic and diluted net loss per common share	$ (0.79)us-gaap_EarningsPerShareBasicAndDiluted	$ (16.13)us-gaap_EarningsPerShareBasicAndDiluted

This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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