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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Summary of Significant Accounting Policies - Computation of Basic and Diluted Income (Loss) Per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Net income (loss)	$ (19,018)us-gaap_NetIncomeLoss	$ (3,928)us-gaap_NetIncomeLoss	$ (12,259)us-gaap_NetIncomeLoss	$ (3,108)us-gaap_NetIncomeLoss	$ (3,205)us-gaap_NetIncomeLoss	$ 6,604us-gaap_NetIncomeLoss	$ (294)us-gaap_NetIncomeLoss	$ (3,366)us-gaap_NetIncomeLoss	$ (38,313)us-gaap_NetIncomeLoss	$ (261)us-gaap_NetIncomeLoss	$ 8,362us-gaap_NetIncomeLoss
Less: undistributed earnings allocated to participating securities											(8,362)
Net income (loss) allocable to common shares									(38,313)	(261)
Basic weighted average common shares outstanding									27,384,990	6,847,697	1,083,276
Basic income (loss) per common share					$ (0.14)us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic	$ (0.24)us-gaap_EarningsPerShareBasic	$ (2.93)us-gaap_EarningsPerShareBasic	$ (1.40)us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 0.00us-gaap_EarningsPerShareBasic
Net income (loss)	(19,018)us-gaap_NetIncomeLoss	(3,928)us-gaap_NetIncomeLoss	(12,259)us-gaap_NetIncomeLoss	(3,108)us-gaap_NetIncomeLoss	(3,205)us-gaap_NetIncomeLoss	6,604us-gaap_NetIncomeLoss	(294)us-gaap_NetIncomeLoss	(3,366)us-gaap_NetIncomeLoss	(38,313)us-gaap_NetIncomeLoss	(261)us-gaap_NetIncomeLoss	8,362us-gaap_NetIncomeLoss
Less: undistributed earnings allocated to participating securities and other add-backs to net income (loss)											(8,362)
Net income (loss) allocable to common shares									$ (38,313)	$ (261)
Basic weighted average common shares outstanding									27,384,990	6,847,697	1,083,276
Effect of dilutive securities									0	0	0
Diluted weighted average common shares outstanding									27,384,990	6,847,697	1,083,276
Diluted income (loss) per common share					$ (0.14)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ (0.24)us-gaap_EarningsPerShareDiluted	$ (2.93)us-gaap_EarningsPerShareDiluted	$ (1.40)us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted	$ 0.00us-gaap_EarningsPerShareDiluted